[THIN] Re: latency
- From: "Bernd Harzog" <bernd@xxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Thu, 3 Oct 2002 17:31:57 -0400
The behavior that Eric describes is very interesting. The important point is
a drop in CPU utilization when the latency occurs. What this means is two
things; 1) The CPU utilization counter is not measuring whatever is causing
the latency, 2) Something is causing the CPU to spend a lot of time doing
something instead of useful work on behalf of user applications.
There is a scenario which we have encountered at customers which fits into
the above explanation. That scenario is that the time that the CPU spends on
certain system level operations (kernel mode operations like Page File
Writes, and Page Faults) is not counted by the CPU utilization counter, AND
that something is making the CPU spend a lot of time these Kernel Mode
operations. The things that can cause these kinds of Kernel Mode operations
to block useful work include a saturated disk driver, a large number of
queued up page writes, a large number of page faults and numerous other
things.
If you are experiencing this kind of behavior, and it is being caused by
excessive paging (watch page file writes in Perfmon), then TSCale will help.
If you are saturating your RAID drivers TScale cannot help.
Cheers,
Bernd Harzog
CEO
KevSoft Corporation
678-455-5509 x701
bernd@xxxxxxxxxxx
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On
Behalf Of Erik Gerard
Sent: Thursday, October 03, 2002 4:17 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: latency
Try watching TaskMgr processor utilization. We found that during these =
intervals that the processor utilization would drop to either 0% or 10% at =
the exact time the problem occured.=20
>>> Frank.Monroe@xxxxxxxxxxx 10/03/02 04:09PM >>>
I'm not sure what kind of detail you want. Office, Exceed, KEA... there =
are
quite a few. When the problem happens, everyone's typing or mouse is
delayed for about four seconds. When I am running a perfmon at the same
time, I get no data collected during the interval. This is unlikely to be =
a
cpu problem since I run the priority of perfmon all the way up during the
capture. Also, if it were a CPU issue, it would have to be two separate
processes causing the takeover.
Frank
-----Original Message-----
From: Bernd Harzog [mailto:bernd@xxxxxxxxxxx]=20
Sent: Thursday, October 03, 2002 4:04 PM
To: thin@xxxxxxxxxxxxx=20
Subject: [THIN] Re: latency
May I ask what applications are running on the servers?
Bernd Harzog
CEO
KevSoft Corporation
678-455-5509 x701
bernd@xxxxxxxxxxx=20
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On
Behalf Of Frank Monroe
Sent: Thursday, October 03, 2002 3:58 PM
To: 'thin@xxxxxxxxxxxxx'=20
Subject: [THIN] Re: latency
I belive you. But, if I see the behavior with less than five users, I =
would
think MS would be interested in fixing it.
-----Original Message-----
From: Bernd Harzog [mailto:bernd@xxxxxxxxxxx]=20
Sent: Thursday, October 03, 2002 3:49 PM
To: thin@xxxxxxxxxxxxx=20
Subject: [THIN] Re: latency
Folks,
I am not advocating the use of TScale as the general solution to this
problem, but we have several reports from customers who have used TScale
for its intended purpose (to increase the number of concurrent users per
server), and that a happy side effect of TScale optimizations has made =
these
typing delays go away. The most common report is from customers who are
using Lotus Notes with MetaFrame and Win2K.
Bernd Harzog
CEO
KevSoft Corporation
678-455-5509 x701
bernd@xxxxxxxxxxx=20
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On
Behalf Of Frank Monroe
Sent: Thursday, October 03, 2002 3:38 PM
To: 'thin@xxxxxxxxxxxxx'=20
Subject: [THIN] Re: latency
This is the exact issue I am working with on MS right now. I have heard
others report this issue. Unfortunately, PSS has apparently no method to
troubleshoot this issue excpet by giving them an image of your system and
running benchmark tools. At leasts, that is what they are telling me. =
They
also claim no one else has this issue. But, you are about the 8th site I
have heard with this issue.
-----Original Message-----
From: Schneider, Chad M. [mailto:CMSchneider@xxxxxxxxx]=20
Sent: Thursday, October 03, 2002 12:44 PM
To: 'thin@xxxxxxxxxxxxx'=20
Subject: [THIN] Re: latency
We are struggling with the typing delay a few seconds.
-----Original Message-----
From: Frank Monroe [mailto:Frank.Monroe@xxxxxxxxxxx]=20
Sent: Thursday, October 03, 2002 11:42 AM
To: 'thin@xxxxxxxxxxxxx'=20
Subject: [THIN] Re: latency
Hello,
Are you talking about echo delay or actual pauses for a few seconds while
typing?
-----Original Message-----
From: rose.ratliffe@xxxxxxxxxxxxxxxxxx=20
[mailto:rose.ratliffe@xxxxxxxxxxxxxxxxxx]=20
Sent: Thursday, October 03, 2002 11:37 AM
To: thin@xxxxxxxxxxxxx=20
Subject: [THIN] latency
Hi,
I am having problem with latency in my XPa /W2K environment. It occurs in
both when using Lotus Notes and Word. It has started getting bad again =
now
that all the staff is back from holidays.
I have done some searching on thethin archives, and found reference to "a
small program that measures latency" but I was unable to find this tool in
the downloads. Anybody know where I can get this to objectively measure
the latency?
We do hae speedscreen defined, and I have seen discussion regarding =
setting
the cursor blink rate (although I'm unclear whether that should be set =
high
or low). I am also going to go looking around tweakcitrix.com, but still =
I
would appreciate any suggestions from you folks.
Thanks.
Rose
***************************************************************************=
*
*************
Rosemarie J. Ratliffe E-mail:
rose.ratliffe@xxxxxxxxxxxxxxxxxx=20
Manager Information Systems Tel: (780) 482 2626
Alberta Medical Association Fax: (780) 482 5445
Edmonton AB T5N 3Z1
***************************************************************************=
*
**************
**********************************************
This weeks sponsor 99Point9.com
99Point9 helps solve your unresolved technical
server-based questions, issues and incidents.
http://www.99point9.com=20
***********************************************
For Archives, to Unsubscribe, Subscribe or
set Digest or Vacation mode use the below link.
http://thethin.net/citrixlist.cfm=20
**********************************************
This weeks sponsor 99Point9.com
99Point9 helps solve your unresolved technical
server-based questions, issues and incidents.
http://www.99point9.com=20
***********************************************
For Archives, to Unsubscribe, Subscribe or
set Digest or Vacation mode use the below link.
http://thethin.net/citrixlist.cfm=20
**********************************************
This weeks sponsor 99Point9.com
99Point9 helps solve your unresolved technical
server-based questions, issues and incidents.
http://www.99point9.com=20
***********************************************
For Archives, to Unsubscribe, Subscribe or
set Digest or Vacation mode use the below link.
http://thethin.net/citrixlist.cfm=20
**********************************************
This weeks sponsor 99Point9.com
99Point9 helps solve your unresolved technical
server-based questions, issues and incidents.
http://www.99point9.com=20
***********************************************
For Archives, to Unsubscribe, Subscribe or
set Digest or Vacation mode use the below link.
http://thethin.net/citrixlist.cfm=20
**********************************************
This weeks sponsor 99Point9.com
99Point9 helps solve your unresolved technical
server-based questions, issues and incidents.
http://www.99point9.com=20
***********************************************
For Archives, to Unsubscribe, Subscribe or
set Digest or Vacation mode use the below link.
http://thethin.net/citrixlist.cfm=20
**********************************************
This weeks sponsor 99Point9.com
99Point9 helps solve your unresolved technical
server-based questions, issues and incidents.
http://www.99point9.com=20
***********************************************
For Archives, to Unsubscribe, Subscribe or
set Digest or Vacation mode use the below link.
http://thethin.net/citrixlist.cfm=20
**********************************************
This weeks sponsor 99Point9.com
99Point9 helps solve your unresolved technical
server-based questions, issues and incidents.
http://www.99point9.com=20
***********************************************
For Archives, to Unsubscribe, Subscribe or=20
set Digest or Vacation mode use the below link.
http://thethin.net/citrixlist.cfm=20
**********************************************
This weeks sponsor 99Point9.com
99Point9 helps solve your unresolved technical
server-based questions, issues and incidents.
http://www.99point9.com=20
***********************************************
For Archives, to Unsubscribe, Subscribe or=20
set Digest or Vacation mode use the below link.
http://thethin.net/citrixlist.cfm=20
**********************************************
This weeks sponsor 99Point9.com
99Point9 helps solve your unresolved technical
server-based questions, issues and incidents.
http://www.99point9.com
***********************************************
For Archives, to Unsubscribe, Subscribe or
set Digest or Vacation mode use the below link.
http://thethin.net/citrixlist.cfm
**********************************************
This weeks sponsor 99Point9.com
99Point9 helps solve your unresolved technical
server-based questions, issues and incidents.
http://www.99point9.com
***********************************************
For Archives, to Unsubscribe, Subscribe or
set Digest or Vacation mode use the below link.
http://thethin.net/citrixlist.cfm
Other related posts:
