IRC chat logs for #ltsp on irc.freenode.net (webchat)


Channel log from 29 September 2012   (all times are UTC)

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00:48
<ltspuser_22>
I have gotten into a bit of a mess and broke the internal config of our Edubuntu lab. I'm not too worried about getting it back but just wanted to let everyone know its present status before I get into the basic issue that I was hoping to get some help with. I would like to
00:49
enable other, non-PXE clients to access the Internet. I understand it can be done.
00:52
Am I on the right track thinking I need coding in the Default LTSP dhcpd.conf config file that would add a condition similar to waht is alread there where it contains " if substring( option vendor-class-identifier, 0, 9 ) = "PXEClient" { filename "/ltsp/i386/pxelinux.0"; } else { filename "/ltsp/i386/nbi.img"; }"?
00:54
under the else section I would want the non-PXEClients to get access to the internet instead of getting nbi.img.
00:57
CTCP version? Not sure what that is but maybe the answer is Edubuntu 12.04?
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03:26
<ltspuser_05>
hello...one silly question i want to ask that can't found the answer in LTSP website......do LTSP server support redirecting sound ??
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06:01
<alkisg>
muppis: dpkg-diverting initctl from ltsp-chroot does seem like a good idea... could you file a bug for it?
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06:51
<muppis>
alkisg, yes. I'll do it at evening when I got more time to focus for it. :)
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08:35
<knipwim>
is there some setting i need to let my local-apps firefox use my logged in user dir?
08:42
<alkisg>
knipwim: afaik, normally no
08:42
knipwim: try ltsp-localapps xterm and pastebin env, it should mention HOME=/home/user
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10:42
<knipwim>
alkisg: it does, but /home/user is empty
10:43
<alkisg>
knipwim: with localapps enabled, that was supposed to have been mounted with sshfs
10:43
knipwim: don't run ls as root though, run it as user
10:43
Root won't see the sshfs contents
10:43
(...maybe)
10:44
<knipwim>
i have
10:44
<alkisg>
grep /home /proc/mounts
10:44
If there's no /home/user there, then you have some sshfs problem
10:44
So try it manually
10:57
<knipwim>
hmm, when logging on to the server with ssh it complains about not being able to create /home/user/.ssh
10:57
even when i already created it manually
11:04
<alkisg>
launch time, bbl
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11:51
<knipwim>
ok, the last error solved
11:51
i can sshfs manually
11:52
but apparently it doesn't do so by default
11:52
which script takes care of this?
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13:02
<knipwim>
ok, looking in /usr/share/ldm/rc.d/X01-localapps
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14:24
<alkisg>
So, booting livecd.iso images from grub2 without having the kernel outside the iso is very easy...
14:24
...we can use that to provide ltsp-fat-client installers for windows :D
14:24
(for fat clients over slow networks, or over wireless)
14:25
win32-loader takes care of installing grub2, then grub2 loads the kernel from within the .iso/squashfs image, and finally a small ltsp initramfs script can mount the iso/squashfs image read only instead of using nbd/nfs
14:27
<muppis>
I (still) use my fat htpc over wlan bridge and I don't see booting time a issue, but it's only client over wlan.
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14:27
<alkisg>
Yeah with multiple clients you'd have problems, 50mbps isn't enough for 12 clients
14:28
<muppis>
I can figure.
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17:47
<markit>
alkisg: these days I had problems with ltsp "frozing" or being really slow (thin), I think I've isulated the problem... https://bugs.freedesktop.org/show_bug.cgi?id=52547 is FF + Libo related
17:47
just to notify you if happens to receive desperate calls from teachers ;P
17:48
<alkisg>
markit: what is "libo"?
17:48
Libreoffice:D
17:48
OK
17:50
markit: are you sure this is what's freezing your clients?
17:50
It doesn't sound like this bug can freeze a pc..
17:51
<markit>
from teacher description I thought was a lan problem
17:51
then I tested the lan and was ok
17:51
last test I logged in the stuedent's account, and it was fine even with the pc it used in teh morning
17:51
then I went in the "recent used" files
17:52
and loaded a writer doc that... froze the libreoffice
17:52
I went in the server and I saw a 100% cpu usage of a core with libreoffice process
17:52
when it fetched the image everything went to normal
17:52
but it took 20 seconds
17:53
I think that if 20 children is doing their research on "cat and dogs" and pasting those nice pictures of the pets in their writer document
17:53
the result can't be different from a desperate situation :)
17:55
I'm also going to write an email to plasma-dev mailing list about kde "high I/O", but I dubt they will fix soon
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17:55
<markit>
also for libo's bug I dubt they will fix soon, has been reported only by 2 people (one is me)
17:55
I'm asking in the dev channel if someone will help me fix the code myself
17:56
because should be trivial, but not programming in C++ and not knowing the insight of 10Million lines of code will not help ;P
17:57
btw, epoptes is working great :)
17:57
looking forward having the multicast feature, sooner or later
17:57
<alkisg>
I can't reproduce the problem, I just copied an image from the internet and paste it to libreoffice and it only took 1 second and 5% cpu
17:58
markit: btw do you have 1gbps NIC on your server?
17:58
If so, then multicasting to ten 100 mbps clients would be the same as now, since in both cases the clients can only get up to 100mbps each
18:00
<markit>
alkisg: do you have FF > 10 ?
18:00
<alkisg>
Stock ubuntu 12.04
18:00
So ff 15
18:00
<markit>
alkisg: maybe you pasted a small image?
18:01
<alkisg>
Give me link to one that reproduces the problem
18:01
<markit>
also we have a 640Kbits connection
18:01
<alkisg>
I tried with the picture from epoptes.org
18:01
<markit>
if you have a 7Mbit you have libo stuck for few seconds, so no problem
18:02
mmm here I've debian with ff 10, so I've not the problem
18:02
you could try to paste multiple pictures in one document, then save and then load
18:03
and I've done the tests you suggested to check the speed of the lan, may I pastebin you the terminal log?
18:03
just to be sure I'm not missunderstanding something
18:04
<alkisg>
No need, of course it downloads the images from the internet, but I don't see the 100% cpu part
18:05
<markit>
btw, http://pastebin.ca/2229951
18:05
<alkisg>
And http://images.psxextreme.com/wallpapers/ps3/quantum_space_617.jpg => 1920x1080 => 220 kb
18:05
<markit>
I'm not sure why ipfef returns to the prompt with some process still running and returning later
18:05
<alkisg>
If one has 10 such images and a very low bandwidth, sure, it would cause delays
18:05
<markit>
alkisg: let me boot the laptop with kubuntu 12.04 and test myself
18:06
yes, but consider 24 clients doing that
18:06
<alkisg>
They shouldn't do that
18:06
They should embed the images instead
18:06
<markit>
yes, but libreoffice has a bug
18:06
if they "paste" the image, instead the "live image" is pasted
18:07
they should do "paste special" and choose "bitmap"
18:07
is FF that has changed behaviour
18:07
<alkisg>
Yes I got the problem
18:07
What about other browsers?
18:07
<markit>
the bug poster tells that every recent browser like Chrome do that
18:07
since they want to make easier to use some google functionality
18:08
is just that libreoffice should improve
18:08
but should do very fast
18:08
<alkisg>
markit: your iperf bandwidth is fine, so for up to 10 clients, multicasting will have about the same performance as single casting (except for the server - side screen grabbing)
18:08
<markit>
good point
18:08
in any case we have 24 :)
18:09
<alkisg>
Multicasting will mostly help servers with 100 mbps bandwidth, it'll make their speed 10 times faster
18:09
With 24 clients, just 2.4 times faster
18:09
Not much
18:09
<markit>
I've checked also with wireshark, and I've found a lot of retransmission, I have to analize the data better to see in % how much
18:09
alkisg: wondering where is the bottle neck then
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18:10
<markit>
the server video board is fast
18:10
<alkisg>
How many FPS do you get with full screen vnc?
18:10
<markit>
do you remember the video I made? probably 2 ? :)
18:11
or better, the effect was of "rotation update"
18:11
you see the first client update, then the second, then the fird... and then the first again
18:11
as far as I remember, at least
18:11
<alkisg>
The bottleneck might be server-side screen grabbing... I'm not sure if x11vnc uses caching when multiple clients connect
18:11
<markit>
btw, dinner time, if you have further considerations write here I will read soon
18:11
<alkisg>
bb
18:12
<markit>
alkisg: I tested video board grabbign with some suggested tools and was high
18:12
but maybe not good enough for video
18:12
<alkisg>
VNC will never be good enough for video
18:12
Even with 1 client and gigabit connection
18:13
For that you'll need a video codec
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19:30
<muppis>
Argh! Unity 2D is freaking me out. :(
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21:12
<vagrantc>
warren: long time no see
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