Re: [RFC 00/10] KVM: Add TMEM host/guest support

Avi Kivity
2012-06-11T11:17:43Z

On 06/08/2012 07:06 PM, Dan Magenheimer wrote:
>> From: Avi Kivity [mailto:avi@redhat.com]
>> <this comment was on Sasha's first round of benchmarking>
>> These results give about 47 usec per page system time (seems quite
>> high), whereas the difference is 0.7 user per page (seems quite low, for
>> 1 or 2 syscalls per page). Can you post a snapshot of kvm_stat while
>> this is running?
>
> Note that the userspace difference is likely all noise.
> No tmem/zcache activites should be done in userspace. All
> the activites result from either a page fault or kswapd.

s/user/usec/...

> Since each streamed page (assuming no WasActive patch) should
> result in one hypercall and one lz01x page compression, I suspect
> that 47usec is a good estimate of the sum of those on Sasha's machine.

It's a huge number for a page. The newer results give lower numbers,
but still quite high.

--
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