Comments inline... > -----Original Message----- > From: Bernd Harzog [mailto:Bernd.Harzog@xxxxxxxxxxx] > Sent: 27 November 2002 16:38 > To: thin@xxxxxxxxxxxxx > Subject: [THIN] Re: Full desktop for 900 users > > Neil, > > I have no doubt that you could configure Perfmon to measure > Kernel Mode activity. My point was that the commonly used CPU > utilization counters like the CPU one in Task Manager do not > fully account for things going in the OS. Again task manager will track kernel activity, if you ask it to. > We know this > because we have seen TScale optimize applications on servers, > reduce page file (kernel mode activity), and then see CPU > utilization go UP. Isn't this slightly expected, though? (I'll elaborate after the next bit...) > This is because some kernel time which was > blocking user time went away, Is it? Or merely that kernel activity that would have required either more of, or slower operations (ie pagefile access) would take longer? > and the CPU was now more > available to do useful work for users. If you either take something slow away like this, you'd expect the cpu to be able to do more, and to actually do more - because it's hasn't got to spend so much time waiting. Don't forget though, that normal physical memory access will be kernel activity (or at least a component of it will be). However, in the scenario to which you allude - effectively less demand for paging, therefore less *slow* access (kernel wait times) - you have higher cpu activity observable because if a higher *rate* of context switches as it's doing more active work with it's timeslices. None of which means, nor implies, that either taskmanager, nor perfmon are misleading - dont' forget, they normally chart activity WRT time. Neil *********************************************************************** This e-mail and its attachments are intended for the above named recipient(s) only and are confidential and may be privileged. If they have come to you in error you must take no action based on them, nor must you copy or disclose them or any part of their contents to any person or organisation; please notify the sender immediately and delete this e-mail and its attachments from your computer system. Please note that Internet communications are not necessarily secure and may be changed, intercepted or corrupted. We advise that you understand and observe this lack of security when e-mailing us and we will not accept any liability for any such changes, interceptions or corruptions. Although we have taken steps to ensure that this e-mail and its attachments are free from any virus, we advise that in keeping with good computing practice the recipient should ensure they are actually virus free. Copyright in this e-mail and attachments created by us belongs to Littlewoods. Littlewoods takes steps to prohibit the transmission of offensive, obscene or discriminatory material. If this message contains inappropriate material please forward the e-mail intact to postmaster@xxxxxxxxxxxxxxxxx and it will be investigated. Statements and opinions contained in this e-mail may not necessarily represent those of Littlewoods. Please note that e-mail communication may be monitored. Registered office: Littlewoods Retail Limited, Sir John Moores Building, 100 Old Hall Street, Liverpool, L70 1AB Registered no: 421258 http://www.littlewoods.com *********************************************************************** *********************************************** This Weeks Sponsor OneApp Total Control Control, Secure and Audit your Thin Client Systems http://www.oneapp.co.uk *********************************************** For Archives, to Unsubscribe, Subscribe or set Digest or Vacation mode use the below link. http://thethin.net/citrixlist.cfm