[K12OSN] Poor performance woes
Jomegat
jomegat at jomegat.com
Tue Sep 20 20:23:02 UTC 2011
On 09/20/2011 04:12 PM, David Hopkins wrote:
> So, runs fine at server console, but lags severely at the thin client
> with the same account. Are you certain that the clients are running at
> 100Mb full duplex? If you've enabled a shell at the client can you
> check to see what ifconfig reports at the client? I would check
> memory/performance at the client with top (in a shell, add
> SCREEN_02=shell in lts.conf, ctl-alt-f2 to access it at the client)
> while the page is being displayed from the GUI login session just to
> convince myself it isn't a load issue at the client.
I will double check, but since I was seeing 12MiB/sec - which is pretty
close to 100 Mbits/sec, I'm thinking they are running at 100. Also, the
LEDs on the switch say 100, and not 10.
>
> Also, Adobe has a 64bit Flash for linux (v11) available as beta. I've
> been running that for the last couple of weeks (since it was released
> IOW) on my systems (Ubuntu 10.04 with LTSP packages added).
> http://labs.adobe.com/downloads/flashplayer11.html It definitely runs
> better than the 32bit flash with nswrapper. Installation was just a
> matter of uninstalling the 32bit flash and copying the 64bit version to
> the correct plugins directory.
Yes, I'm using the 64-bit Flash, and not the nswrapper version.
Further, I can't find any flash content in the page he's loading, just a
truckload of javascript.
>
> Those are the things that I'd check first.
Thanks.
>
> Sincerely,
> Dave Hopkins
> Newark Charter School
>
> On Tue, Sep 20, 2011 at 3:18 PM, Jomegat <jomegat at jomegat.com
> <mailto:jomegat at jomegat.com>> wrote:
>
> I have a K12Linux setup based on EL6-64. The TC's are ancient
> i686's with 256M RAM and 10/100 nics. The TS has a gigE NIC, and
> between the TS & TCs is a managed switch with 2 gigE ports and 24
> 10/100 ports. The TS is connected via one of the gigE's.
>
> We have a student who is having real performance problems when he
> loads a page. I went in today to be there while he was experiencing
> woe, and ran the system monitor applet.
>
> When he loads the web page - with no flash in it that I can find -
> the network maxes out at 12MiB/sec, and it takes an eternity for the
> page to load. He reports that sometimes this particular page will
> cause the TC to crash (black screen with text followed by login
> screen), but he was not able to reproduce that while I was there. I
> suspect there is some user error involved in the crash scenario, but
> it will be difficult to prove.
>
> I had tried running firefox as a local app last month, but the
> school needs flash, and it requires 512M. Performance on these TC's
> was substantially worse when running FF as a local app, so I backed
> off of that.
>
> The page he was trying to load is password protected, but I had him
> ctrl-U while he had it open, and save the source to a file which I
> can share if need be. It is filled with javascript, but I'm not
> sure that's the culprit (though it seems the most likely suspect).
> I found no .flv, FLV, .swf, or .SWF in the file anywhere.
>
> As an experiment, I connected a monitor, keybd, and mouse directly
> to the server and had him login there. The page loads just fine
> that way. That might be a possible solution, but for some reason,
> the display is incredibly blurry. If I make that permanent, I'd
> have to run some cable through the wall (they're pinched in the door
> right now, and barely reach).
>
> Before they called me in to look at this, he had been bringing his
> mom's laptop to school so he could do his work (it's an online
> course). If it crashes while he is taking a quiz, he loses a test
> attempt or gets a bad grade, so this has to be reliable.
>
> His mom is on the school board, and she is pushing the school to
> abandon LTSP in favor of a Windows solution. They think that if
> they install some flavor of windows on the TC's they will get better
> performance, but I believe they won't, as flash will need 512M no
> matter the OS. I think they will need all new PC's if they go that
> route.
>
> I am on the cusp of losing my network to Windows, at which point I
> will resign my post as unpaid volunteer sysadmin, so if I sound a
> little desperate, now you know why.
>
> Any help here would be greatly appreciated.
>
> --
> Jim Thomas Principal Applications Engineer Bittware, Inc
> jthomas at bittware.com <mailto:jthomas at bittware.com>
> http://www.bittware.com (603) 226-0404 x536
> <tel:%28603%29%20226-0404%20x536>
> The problem with the future is that it keeps turning into the
> present - Hobbes
>
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--
Jim Thomas Principal Applications Engineer Bittware, Inc
jthomas at bittware.com http://www.bittware.com (603) 226-0404 x536
The problem with the future is that it keeps turning into the present -
Hobbes
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