[THIN] Re: XenApp 5 - 2008 x64 Slow

  • From: "James Scanlon" <James.Scanlon@xxxxxxxxxxxxxxxx>
  • To: <thin@xxxxxxxxxxxxx>
  • Date: Thu, 6 Jan 2011 16:40:27 -0000

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 users.

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 info...

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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