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


Channel log from 7 October 2012   (all times are UTC)

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19:01
<markit>
hi alkisg, I've digged a little about KDE and I've found that lnusercache or whatever fails simply because you can't create symlink in sshfs fuse whatever
19:01
(nor you can among 2 nfs mounts)
19:01
<alkisg>
Can't create symlink?!
19:02
<markit>
seems not
19:02
I've google a little, also I've tried in the shell
19:02
of course, I'm not as good as you so I could have made a mistake
19:02
<alkisg>
I've tried in the shell too, of course you can create symlinks with sshfs
19:02
<markit>
I've changed a KDE variable (not sure if I did right, I was the cache be created in .cache while is in .kde now)
19:03
but is slow like before
19:03
<alkisg>
What's the proper name of "lnusercache"? I can't find anything on google with it.
19:03
<markit>
let me find the proper name
19:03
I've in kubuntu, man whatever told me what it does
19:04
lnusertemp
19:04
"lnusertemp — tool to create KDE resources and symlinks to them"
19:04
is used in the /usr/bin/startkde
19:04
in any case I've tried something like
19:04
marco@ltsp102:~/.kde$ LANG=C ln -s /tmp/kde-marco pluto
19:04
ln: failed to create symbolic link `pluto': Operation not permitted
19:05
but now I wonder if /tmp/kde-marco existed
19:06
<alkisg>
It doesn't matter, what matters is if you have ssh_follow_symlinks=true or false
19:06
So, if the problem is that KDE wants a tmp file per user, why not create it in ~/.cache/kde-tmp instead?
19:06
Finally, all those MB on login are caused by temp files?
19:06
It sounds silly...
19:08
<markit>
with ssh_follow_symlinks=true it gives that error
19:08
I've to set it false and add /var/tmp in the mounted directories
19:08
I've changed KDEVARTMP to point to .cache
19:09
<alkisg>
ssh_follow_symlinks is false by default for links under ~/home, and true for extra_mounts
19:09
<markit>
maybe I did something wrong, since now it creates under .kde
19:09
ah!
19:09
<alkisg>
Anyway remind me in a week or so to have a look at kde+ltsp
19:09
<markit>
in any case, even if cache file are created under .kde I've a 600MB issue
19:10
ok, don't worry, I will :)
19:10
<alkisg>
I'll try ltsp-pnp there, and check fat clients and see how they can bypass the cache problems
19:10
<markit>
I called you because I thought that my "discover" that ln -s failing in sshfs was important, but seems that you think can be done and I did something wrong
19:10
how is it going with ltsp-pnp?
19:11
I need Phantomas soon ;P (joking)
19:11
<alkisg>
All work fine so far... sshfs is eating up some CPU, but if the users don't have huge files it's not a big problem
19:11
The problem with sshfs and symlinks is that when ssh_follow_symlinks is true, then you can create them but you can't delete them afterwards, you can't separate them from real files
19:12
<markit>
so use a more "cpu friendly" encryption could be something to investigate?
19:12
oh!
19:12
<alkisg>
You'd need to maintain an ssh fork for that, upstream doesn't want to include the NULL cipher (unencrypted)
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19:13
<alkisg>
But yeah, some research for lighter encryptions might help there
19:13
<markit>
or going back to NFS?
19:13
you told me about some troubles only with some brand and model of nics
19:13
maybe is a driver problem that will be addressed soon
19:13
<alkisg>
Right, but only if teachers do actually report that normal classroom usage is causing too high server cpu usage
19:14
Atheros had problems with NFS, yes, I don't know if it has been solved in 12.04
19:14
<markit>
I think should become an issue if you have a "mix" environment, some fat and some (older / less powerful) thin
19:14
<alkisg>
It could be worked-around with some mounting options
19:15
E.g. encrypting 5 MB per user shouldn't be a problem, but 100+ MB would be.
19:15
I have on my TODO list to check the CPU usage on a real classroom with 20 fat clients... some of these days...
19:16
<markit>
:)
19:16
well, as soon as I've my children leave the other PC, I will try to collect some data about KDE, I've found a dev that maybe will have a look
19:16
<alkisg>
Cool
19:17
<markit>
so when you will have time for some test, maybe we can already have some "feeling" by them
19:17
but seems that everyone thinks that is a problem of some other part of kde
19:18
and no one wants to really understand, not using ltsp themselves
19:18
maybe I've should have used lxde from the beginning, in schools usually they use programs, not the desktop
19:18
but most of the programs I know are of kde, so...
19:20
<alkisg>
We don't usually install any kdeedu programs due to all the kde-libs dependencies
19:20
Only in highschools we have to use kolourpaint and kturtle... and while I hate pulling all the KDE libs, we did include them in the high school live/installation DVDs
19:21* alkisg wished kdeedu was qtedu instead :-/
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19:33
<gvy>
alkisg, al-qedu? :)
19:40
<alkisg>
:P
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20:20* highvoltage waves from sherbrooke
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