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Re: [Xen-devel] scaling problem with writable pagetables

from [Andrew Theurer]

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To:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject:	Re: [Xen-devel] scaling problem with writable pagetables
From:	Andrew Theurer <habanero@xxxxxxxxxx>
Date:	Thu, 16 Feb 2006 07:41:37 -0600
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Keir Fraser wrote:

On 15 Feb 2006, at 18:49, Andrew Theurer wrote:
Below are per-function ratios of CPU timerev8830/rev8830-lock-reduction (derived from oprofile diffs)
SDET:

9.84/1   restore_all_guest
Kind of odd, since that function contains no locking. Perhaps VCPUsare blocked so long that, by the time they get the CPU there is anevent pending and the hypercall gets preempted?

I was a bit surprised at that, too.

What do the perfctr numbers look like for #hypercalls and #exceptions?Also worth adding one to __hypercall_create_continuation as that'llcount #preemptions.

I have not taken perfctr numbers yet, but I will today.  Thanks,

-Andrew


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