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Re: [Xen-devel] time accounting problem in pvops kernel
| To: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] time accounting problem in pvops kernel |
| From: | Paolo Bonzini <pbonzini@xxxxxxxxxx> |
| Date: | Wed, 18 Aug 2010 09:49:28 +0200 |
| Cc: | Glauber Costa <glommer@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Wed, 18 Aug 2010 00:51:36 -0700 |
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On 08/18/2010 12:51 AM, Jeremy Fitzhardinge wrote: On 08/17/2010 10:29 AM, Paolo Bonzini wrote:Hi, while experimenting a bit with time.c we found a bug in time accounting. Basically, /proc/stat counts idle time twice for PV guests running a pvops kernelWhat version? I was using the latest RHEL6 snapshot + the 16-patch blkfront series (i.e. without the patch you pointed out). Upstream and stable kernels contain the changeset "xen: drop xen_sched_clock in favour of using plain wallclock time" which should fix a lot of timekeeping/scheduling problems. I'll try this patch; however, offhand I don't see how it fixes the problem of calling account_idle_ticks twice. Paolo _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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