On Fri, Aug 28, 2009 at 8:29 AM, Agblad Tore<tore.agb...@volvo.com> wrote:
> We are running a test of a TWS server on a SLES10 SP2, and it uses a lot of > cpu > without any load. > Inside the Linux top cmd indicate about 1% or less cpu used in total. > z/VM reports about 9% cpu ! > What is he doing ? > It's a bundled WAS used by the TWS that we suspect doing something. > Anybody having this problem or have a clue what to do ? > It's TWS 8.5, z/VM 5.4 and SLES10 SP2. > The linux server has 1GB memory, we have tried with 2GB, no change. Takk for sist, Tore. What's happening is that the application is polling with very short delay and thus getting tiny amounts of CPU time from z/VM but very often. In this situation a kernel bug starts to play a role in that some of the cost of waking up and going to sleep is not accounted for by Linux. The kernel code has now been changed and the fix for this will appear sometime in the service stream. With that, Linux will also see 9% CPU (as system time) Rob -- Rob van der Heij Velocity Software http://www.velocitysoftware.com/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
