[K12OSN] Poor performance woes
jomegat at jomegat.com
Tue Sep 20 20:57:42 UTC 2011
On 09/20/2011 04:34 PM, Dean Jones wrote:
> +1 on the 64 bit flash. Much better performance if the problem is
> flash related.
The page he's trying to load has no flash. When I was testing, I had
all the TC's playing full-screen youtube vids. It was a little laggy,
but it did not fall to its knees.
> As you know Windows will perform poorly on those clients as well
> regardless of the server specs. It is dated hardware with little
> video memory.
I know that full well. I doubt the ability of the school board to
understand that though until they give it a whirl. The TC's actually
have HD's in them with Win2K. I've considered booting into that and
giving them a demo.
To add injury to insult, the board member I mentioned previously is
bringing in a "computer person" to "evaluate our needs". Grrrr.
Nevermind that I'm a software engineer with over 25 years of experience.
> You can try nbdroot for a slight speed increase over NFS if the
> problem is file i/o related.
It's already using nbd.
Thanks for your suggestions.
> On Tue, Sep 20, 2011 at 1:12 PM, David Hopkins<dahopkins429 at gmail.com> 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.
>> 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.
>> Those are the things that I'd check first.
>> Dave Hopkins
>> Newark Charter School
>> On Tue, Sep 20, 2011 at 3:18 PM, Jomegat<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
>>> (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 http://www.bittware.com (603) 226-0404 x536
>>> The problem with the future is that it keeps turning into the present -
>>> K12OSN mailing list
>>> K12OSN at redhat.com
>>> For more info see<http://www.k12os.org>
> K12OSN mailing list
> K12OSN at redhat.com
> For more info see<http://www.k12os.org>
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 -
More information about the K12OSN