[THIN] Re: XenApp 5 - 2008 x64 Slow

  • From: "James Scanlon" <James.Scanlon@xxxxxxxxxxxxxxxx>
  • To: <thin@xxxxxxxxxxxxx>
  • Date: Fri, 7 Jan 2011 09:04:46 -0000

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>

        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


        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

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

        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 CIFS.


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


        @ 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

        @ 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


        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 following




(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 previously.

        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 bottleneck?









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