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Re: [Xen-devel] scaling problem with writable pagetables
| To: | Andrew Theurer <habanero@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] scaling problem with writable pagetables |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 16 Feb 2006 08:54:33 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 16 Feb 2006 09:08:12 +0000 |
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On 15 Feb 2006, at 18:49, Andrew Theurer wrote: Below are per-function ratios of CPU time rev8830/rev8830-lock-reduction (derived from oprofile diffs)SDET: 9.84/1 restore_all_guest Kind of odd, since that function contains no locking. Perhaps VCPUs are blocked so long that, by the time they get the CPU there is an event pending and the hypercall gets preempted? What do the perfctr numbers look like for #hypercalls and #exceptions? Also worth adding one to __hypercall_create_continuation as that'll count #preemptions. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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