[THIN] Re: XenApp 5 - 2008 x64 Slow

  • From: "Joe Shonk" <joe.shonk@xxxxxxxxx>
  • To: <thin@xxxxxxxxxxxxx>
  • Date: Wed, 12 Jan 2011 00:41:35 -0700

Did you guys see this?






From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of James Scanlon
Sent: Friday, January 07, 2011 2:05 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: XenApp 5 - 2008 x64 Slow


ah the irony :)



From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Christopher Wilson
Sent: 06 January 2011 21:35
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: XenApp 5 - 2008 x64 Slow

Wow, that's a big deal since AppSense is supposed to add like 30% more


I've starting seeing slowness now that my new farm is more heavily loaded.
I'll have to give this a look as well.

On Thu, Jan 6, 2011 at 10:50 AM, Andy Friar <Andy.Friar@xxxxxxxxxxx> wrote:

Thanks James, 


I'll disable PM in the short term and do some further checks






From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of James Scanlon
Sent: 06 January 2011 16:40

To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: XenApp 5 - 2008 x64 Slow


We narrowed it down to a combination of Appsense Performance Manager and
Environment Manager

With PM disabled the server is snappy, quick, and as we would expect (though
EM adds around 10-15 seconds to the logon as per the rules we have defined)


We are in the process of discussing with Appsense and other support avenues
as to where the exact issue lies

As far as we are concerned however the crisis is averted, all production
systems have PM disabled, all servers are getting over 70 users without
missing a beat

Individual load tests push the servers to 100 users (so far) without
issue...(re enabling PM and the server is game over at 45-50 users)


James :)




From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Landin, Mark
Sent: 06 January 2011 15:42
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: XenApp 5 - 2008 x64 Slow

James Scanlon just had a very similar, if not exactly the same, problem with
his systems and he finally fingered Appsense as the culprit. I suggest
reviewing the list archives for his messages in the November / December
timeframe for details. I'll copy his final response on 12/13:


"We have troubleshooted this to APPSENSE. When all three products (AM, EM
And PM are enabled) the server doubles users logons from 14s to around 30,
and progressivly gets worse until the server completely crashes around 45

Stopping any of the three services of appsense relieves the issue.

Stopping appsense completely sees the server behave as we would expect sub
15second logons, for over 100 users, instant launching of programs.

Further investigation continues and will update the list when we have more

Thanks to all for your input.





You may wish to experiment with disabling Appsense in your environment to
see if it's the culprit in your case.





From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Andy Friar
Sent: Thursday, January 06, 2011 9:10 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] XenApp 5 - 2008 x64 Slow


I'm have a problem with the following Windows 2008 SP2 Enterprise x64 

XenApp 5 Enterprise R01


Boxes are Dell blade 8 core + HT  49Gb RAM

Local manadatory profiles with full Appsense suite utilising EM +
Personalisation service.

Desktop / My Documents / Favourites redirected to a Netapp Filer running


The more users that come onto the box the slower the machine gets.


@ 0-45 users the box is responsive, logon times are good but it still has
this apparent lag when accessing local apps

@ 50 the lag is getting worse sometimes freezes but always comes back.

@ 60 logon times are substantial, just selecting a cell in excel can take
30+ seconds.


Performance counters seem fine


14% processor time

25k context switches / sec no massive jumps

0 Processor queue length 

99% disk idle

0 disk queue length

15-20k threads

0 Redirector\Current Commands


The only large one is system calls / sec which can be anywhere from 80k to
1.5m, I've cut down the apps but system calls are still high.


To me the server feels as if it has no cpu left, but given the resources
free it looks more like an i/o problem, I've tuned the smb with the




"MaxMpxCt"=dword:00000800                                 (subsequently has
been changed to match the Netapp)








Manager\Configuration Manager]




The NetApp filer has had cifs.max_mpx set to 1124 so I've subsequently
changed the citrix servers to match this number rather than the 2048

It's running around 30%cpu 2000 io/sec 98% cache hit.


Any suggestions on where else I might look into what is causing the









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