[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] strange CPU utilization, could related to credit schedule ?
Where is that 85% number coming from -- is this from within the VM, or from xentop? If it's Windows reporting from within the VM, one hypothesis is that it has to do with processing and running with virtual time. It may simply be a side effect of the VM only getting a small percentage of the cpu. If it's xentop, it's probably the vm reacting somehow to getting only a small percentage of the CPU. We saw something like this with early versions of Windows 2k3, but that problem was addressed in later service packs. At any rate, to find out what Windows is doing would require a bit more investigation. :-) -George On Wed, Jan 12, 2011 at 2:41 PM, tinnycloud <tinnycloud@xxxxxxxxxxx> wrote: > Hi Geogre: > > We have quite strange CPU usage behaivor in one of our DomU(2008 > HVM) > Totally, our host has 16 physical CPU, and 9 VMS. > > Most of time, the all VMs works fine, the CPU usage are low and > resonable, > But at every high workload time(say 9:00-11:00AM, there are 8 VMs, each is a > web server, > cutomers accesses the page at this time), we login into the 9th VM which > is idle, find that > its CPU usage is at 85%, doesn't make any sense since we have no task > running, also the > usage distrbutes evenly across most of the processes. > > I wonder if it relates to CPU schedule algorithm in Xen. > After go > through http://lists.xensource.com/archives/html/xen-devel/2010-07/msg00414.html > I can't figure out any assumptiones explains our situation. > So what do u think of this? > > Many thanks. > > > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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