IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 29 June 2010 (all times are UTC)
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| 06:55 | <zeitsofa> hello :) i can not login from thinclients. No answer from server - how can i fix this?
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| 06:56 | <alkisg> sudo ltsp-update-sshkeys && sudo ltsp-update-image
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| 06:58 | <zeitsofa> hmm ok thanks i try it. did i have to run update-sshkeys everytime befor i update the image?
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| 07:00 | <alkisg> No, only when the server IP is changed
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| 07:59 | <denisesball> alkisg: that was an interesting test case
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| 07:59 | any idea what the cause is then?
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| 08:00 | <alkisg> denisesball: see the follow up on the list, it's about the pixmas
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| 08:00 | pixmaps
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| 08:00 | <denisesball> list?
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| 08:00 | <alkisg> On the ltsp mailing list... ah, you didn't see it..
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| 08:01 | <denisesball> no, i'm not on the list
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| 08:01 | <alkisg> https://bugzilla.mozilla.org/show_bug.cgi?id=575523
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| 08:01 | that's the test case, but this has more info in it:
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| 08:01 | https://bugzilla.mozilla.org/show_bug.cgi?id=395260
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| 08:01 | <denisesball> ah, so you did file a bug. nice!
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| 08:02 | <alkisg> Also, if you run: MOZ_DISABLE_IMAGE_OPTIMIZE=1 firefox
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| 08:02 | ...then it doesn't use pixmaps, so the clients shouldn't crash
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| 08:02 | <denisesball> what is pixmaps exactly?
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| 08:03 | * alkisg is the middle of something, bbiab... | |
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| 10:28 | <zeitsofa> did anybody know how i have to configure dhcp3-server to use two pxe servers?
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| 10:29 | <atkuepker> we usually end up declaring next-server and manually adding the option root-path lines to dhcpd that point to a given server.
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| 10:34 | <zeitsofa> hmm i crate a nopaste http://nopaste.info/e507f43d0f.html how is the pleace for the second "next-server"?
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| 10:37 | <atkuepker> I usually put it in the subnet declaration, but I don't know whether that's required or not. I'd suggest reading through the documentation for DHCP
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| 10:40 | <zeitsofa> http://nopaste.info/88e357d2e9.html :( i think thats not the right place for it. im search in dhcp doc for a solution. thx :)
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| 10:45 | <atkuepker> always good to start with 'man dhcpd.conf'
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| 11:40 | <hughessd> hello ltsp
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| 11:42 | quick question: is it recommended to use RDIMMs or UDIMMs for a LTSP server?
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| 11:48 | <hughessd> hmmmm.....
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| 11:48 | maybe i should come back at night
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| 11:48 | when everyone is awake....
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| 11:49 | <alkisg> Give it some time... :)
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| 11:49 | <zeitsofa> hughessd: we have RDIMMs and it works fine.
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| 11:50 | hughessd: because wi didn't have UDIMMs for our server :)
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| 11:50 | *we
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| 11:51 | <atkuepker> sufficient memory and stable hardware is all that really matters, IMHO. Whether the memory is ECC Registered or not hasn't one of the more critical aspects of our dozen or so LTSP deployments.
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| 11:53 | We're using IBM X3550 and x3400 servers nowadays. They run quite well and have a rather good warranty. While I used to be an IBMer, I've not ever had any problems with the hardware either.
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| 11:54 | and the minor things that have come up were repaired promptly and without hassle.
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| 12:00 | <denisesball> alkisg: MOZ_DISABLE_IMAGE_OPTIMIZE=1 isn't an lts.conf option correct?
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| 12:00 | <alkisg> No, it's an environment option
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| 12:01 | I.e. close firefox, open a terminal, and type:
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| 12:01 | MOZ_DISABLE_IMAGE_OPTIMIZE=1 firefox
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| 12:01 | <denisesball> yeah i can't really tell all the techs to do that...is there a way to set it system wide?
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| 12:01 | <alkisg> Then go to the page that crashed your client - it shouldn't crash now.
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| 12:01 | Yes, in /etc/profile or somewhere similar.
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| 12:02 | <denisesball> ok i will try that
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| 12:02 | and the bugs you sent me, looks like an old issue huh?
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| 12:02 | <alkisg> Yup
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| 12:02 | So I'm not too optimistic about a quick solution
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| 12:03 | <denisesball> sucks, and its just a firefox thing too. konqueror doesn't have this issue. also, old firefox doesnt seem to have the issue either
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| 12:03 | i have debian 4 servers with iceweasel 2.0 and they dont crash
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| 12:09 | alkisg: "MOZ_DISABLE_IMAGE_OPTIMIZE=1 firefox" still couldnt load the site
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| 12:09 | did you have luck with it?
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| 12:10 | <alkisg> Yes, it worked fine. Did you already have firefox open when you ran it?
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| 12:10 | <denisesball> no i rebooted the whole terminal and logged in and ran it from terminal
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| 12:10 | <alkisg> I tried with an image that should cause 800MB of RAM usage by Xorg, so I'm pretty sure that works around the problem in my case.
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| 12:10 | (vbox client)
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| 12:10 | <denisesball> this is with the default NBD swap and X_RAMPERC set to 80
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| 12:10 | <alkisg> (with 128 MB RAM)
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| 12:10 | <denisesball> is your example public?
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| 12:11 | <alkisg> Yes, it's on the bug report
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| 12:11 | <denisesball> jgarigen.com still hung it like crazy
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| 12:12 | clicking your 5120x5120 without setting MOZ_DISABLE_IMAGE_OPTIMIZE=1 completely hangs the term
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| 12:13 | <alkisg> distro/version?
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| 12:13 | <denisesball> ubuntu 10.04
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| 12:13 | <hughessd> zeitsofa & atkuepker: thank you for the info. very helpful.
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| 12:13 | <alkisg> Yes, without that it also hangs for me too
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| 12:13 | But with that, it doesn't
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| 12:13 | <denisesball> ok lemme try with it
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| 12:14 | i guess i misread the your bug saying that one was ok
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| 12:14 | <hughessd> sorry for taking so long to respond. stepped out for a sec.
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| 12:14 | <alkisg> jgarigen doesn't hang here
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| 12:15 | Ooops scratch that.
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| 12:15 | The image loaded, but _then_ it hanged
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| 12:15 | <denisesball> this is such a big problem i think
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| 12:16 | lots of sites embed images improperly
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| 12:16 | <alkisg> So there must be some other case which uses pixmaps other than the big image
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| 12:27 | <denisesball> even with MOZ_DISABLE_IMAGE_OPTIMIZE=1 loading your 5120x5120 crashes my term
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| 12:28 | should i increase my X_RAMPERC=80 to 90 or even try removing it?
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| 12:33 | <alkisg> It shouldn't matter.
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| 12:33 | <denisesball> alkisg: i let it go and it JUST loaded
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| 12:33 | <alkisg> It shouldn't use any xorg memory at all, in this case.
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| 12:33 | <denisesball> so took almost 6 minutes to load that image
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| 12:34 | <alkisg> Do you have compcache enabled?
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| 12:34 | <denisesball> and the terminal was completely unusable that whole time
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| 12:34 | <alkisg> (== the default?)
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| 12:34 | <denisesball> what is that?
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| 12:34 | <alkisg> compcache takes away 25% of your RAM to make a swap file out of it
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| 12:35 | For low ram clients this isn't good, and if you have an nbd swap file, you don't even need it
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| 12:35 | So if you put nocompcache in pxelinux.cfg/default, you free that 25% of RAM
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| 12:35 | <denisesball> i havent done anything like that
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| 12:35 | just using the nbdswap
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| 12:35 | <alkisg> That's the main cause of the "client goes slow" problems
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| 12:36 | (other than ldm_directx, that is)
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| 12:42 | <denisesball> so alkisg are you suggesting i enable that then?
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| 12:43 | <alkisg> Yup I suggested that to you yesterday...
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| 12:43 | It helps a lot for 128 MB clients.
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| 12:43 | (it's not specific to this case; it just frees an additional 30MB RAM on your clients)
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| 12:44 | <denisesball> sorry dont know how i missed that
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| 12:44 | is it in the manual?
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| 12:44 | <alkisg> No
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| 12:44 | It's not specific to LTSP, it's an Ubuntu thing
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| 12:45 | <denisesball> ok, so where should i look to find out how to do it?
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| 12:46 | <alkisg> gedit /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default
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| 12:46 | And put "nocompcache" right next to "quiet splash"
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| 13:08 | * Lns waves to fellow ltsp people | |
| 13:12 | <Ghid0rah> Greetings LNS.
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| 13:13 | <Lns> Hi Ghid0rah
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| 13:13 | how are you?
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| 13:13 | <Ghid0rah> I'm doing well, I got my LTSP server in testing with 12 terminals
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| 13:13 | actual students using them... life is good.
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| 13:16 | <Lns> good!!
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| 13:16 | * Lns likes hearing about students using linux =) | |
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| 13:21 | <Lns> Ghid0rah: what's your setup again? I forgot
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| 13:22 | <Ghid0rah> I currently have 1 LTSP server running on a VM
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| 13:22 | In production we have 3 LTSP Servers running like LTSP 4.2?
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| 13:22 | running fedora
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| 13:23 | I'm attempting to replace those 3
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| 13:23 | I had wanted to cluster 3 new ones... but I don't think I'm going to get to it in time.
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| 13:24 | <Lns> nice
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| 13:25 | Anyone here using KOffice (KPresenter in particular) with LTSP? If so, how does it stack up against OOo Impress as far as stability and usage on a terminal?
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| 13:37 | <denisesball> alkisg: do i need to do ltsp-update-image after adding to /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default?
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| 13:37 | <alkisg> No
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| 14:55 | <denisesball> alkisg: i tried the nocompcache, this is my output from my terminal:
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| 14:55 | testagent@ltsp133:~$ free -m
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| 14:55 | total used free shared buffers cached
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| 14:55 | Mem: 117 114 2 0 41 32
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| 14:55 | -/+ buffers/cache: 41 76
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| 14:55 | Swap: 93 0 9
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| 14:55 | is that normal?
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| 14:55 | seems like a lot of RAM used
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| 15:00 | <alkisg> denisesball: lsmod | grep ram
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| 15:01 | <denisesball> from the localapp xterm?
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| 15:01 | <alkisg> Yes
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| 15:01 | (you may need to do /sbin/lsmod)
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| 15:02 | <denisesball> 1 sec, sorry
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| 15:02 | <alkisg> Because it looks to me that you have 64 MB NBD_SWAP and 30 MB compcache swap.
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| 15:04 | <denisesball> append ro initrd=initrd.img quiet splash nocompcache nbdport=2000
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| 15:04 | thats my /var/lib/tftpboot/ltsp/i386/pxelinux.cfg/default line
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| 15:04 | <alkisg> It looks ok
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| 15:04 | <denisesball> 1 sec until my term is back up
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| 15:04 | <alkisg> Did you change your nbdswapd.conf to 93MB ?
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| 15:04 | <denisesball> i actually deleted that file to put it back to default
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| 15:06 | testagent@ltsp133:~$ lsmod | grep ram
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| 15:06 | ramzswap 6362 1
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| 15:06 | xvmalloc 4074 1 ramzswap
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| 15:06 | lzo_decompress 2189 1 ramzswap
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| 15:06 | lzo_compress 1853 1 ramzswap
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| 15:07 | <alkisg> Right, so compcache wasn't disabled.
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| 15:07 | Hmm...
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| 15:07 | (you're losing 30 MB to that)
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| 15:07 | <denisesball> yeah, i wonder why
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| 15:07 | <alkisg> It's a technique to make the live cd work with less than 512 RAM
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| 15:08 | <denisesball> oh i think i know why
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| 15:08 | im booting using gpxe over the WAN with the commnands you taught me
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| 15:09 | kernel /ltsp/i386/vmlinuz ro initrd=initrd.img ip=${ip}:${next-server}:${gateway}:${netmask}:${hostname}:eth0:none
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| 15:09 | initrd /ltsp/i386/initrd.img
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| 15:09 | <alkisg> Yeah I was about to ask you to cat /proc/cmdline
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| 15:09 | <denisesball> sorry i didnt even think of that
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| 15:09 | <alkisg> So yup, put "nbd_proxy=false nocompcache" there
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| 15:09 | (nbd_proxy will save you same more MB and speed)
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| 15:10 | <denisesball> k, lemme make a new floppy
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| 15:10 | <alkisg> Just press Ctrl+B
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| 15:10 | <denisesball> oh, itll still load the floppy?
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| 15:10 | or u want me to type all that?
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| 15:10 | <alkisg> Ah, you'll have to write all of it, so nah...
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| 15:10 | Make another floppy
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| 15:11 | <denisesball> yeah, too long and id probly typo and it gets frustrating
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| 15:11 | ive done it a bunch before u taught me about the flopyy lol
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| 15:12 | does it matter what line i put that on? first, last middle etc?
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| 15:13 | obviously before boot vmlinuz
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| 15:14 | <alkisg> It does matter, you need to put it on the same line as quiet splash
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| 15:15 | <denisesball> i dont specify that in mine though
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| 15:15 | my script - http://pastebin.com/wnUD78ac
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| 15:16 | <alkisg> In the kernel line
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| 15:16 | kernel /ltsp/i386/vmlinuz ro initrd=initrd.img ip=${ip}:${next-server}:${gateway}:${netmask}:${hostname}:eth0:none nbd_proxy=false nocompcache
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| 15:17 | <denisesball> k
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| 15:24 | testagent@ltsp133:~$ free -m
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| 15:24 | total used free shared buffers cached
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| 15:24 | Mem: 117 114 2 0 41 32
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| 15:24 | -/+ buffers/cache: 41 75
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| 15:24 | Swap: 63 0 6
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| 15:25 | thats looks better for swap
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| 15:25 | but shouldnt there be more regular ram free?
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| 15:29 | <alkisg> No, but there should be less buffers/cache... did you run free on both cases with the same programs open? E.g. you don't have firefox open in the second case, and not in the first, do you?
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| 15:30 | <denisesball> i have nothing open in either except for gnome-terminal
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| 15:33 | <alkisg> Anyway try firefox now, it should behave better than before.
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| 15:33 | (a little) :)
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| 15:33 | <denisesball> haha ill try
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| 15:34 | thanks again alkisg, as always you are extremely helpful
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| 15:34 | and you see to be there at every hour of the day lol
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| 15:34 | <alkisg> Heh... I'll have to leave for the next 2 years though otherwise I'm not going to finish my phd :)
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| 15:34 | Too many interruptions :)
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| 15:35 | <Lns> Is lts.conf a place where I can put an environment variable for Firefox (not localapp) to pick up on a terminal? MOZ_DISAZBLE_IMAGE_OPTIMIZE=1 specifically
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| 15:35 | <denisesball> Lns: no i think i asked that earlier and alkisg mentioned /etc/profile
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| 15:35 | <alkisg> Lns, nope, try /etc/profile
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| 15:35 | <denisesball> jinx
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| 15:35 | buy me a phd
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| 15:35 | <alkisg> Heh
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| 15:35 | <Lns> alkisg: denisesball thanks =)
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| 15:36 | * alkisg is trying to write his CV in english, if any native speaker feels like reviewing it please pm me :) | |
| 15:36 | <Lns> have you guys been using that var? Does it seem to work ok?
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| 15:37 | <denisesball> alkisg: of course i would! i owe you plenty
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| 15:37 | <alkisg> Thanks! I'll PM you the link...
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| 15:38 | <denisesball> k
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