From: Avi Kivity <avi@redhat.com>
To: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Sasha Levin <levinsasha928@gmail.com>,
mtosatti@redhat.com, gregkh@linuxfoundation.org,
sjenning@linux.vnet.ibm.com, Konrad Wilk <konrad.wilk@oracle.com>,
kvm@vger.kernel.org
Subject: Re: [RFC 00/10] KVM: Add TMEM host/guest support
Date: Mon, 11 Jun 2012 14:17:26 +0300 [thread overview]
Message-ID: <4FD5D3C6.6090003@redhat.com> (raw)
In-Reply-To: <2c1ba6f0-0089-4bfc-be25-61b55a2c1fbc@default>
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.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-06-11 11:17 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-06 13:07 [RFC 00/10] KVM: Add TMEM host/guest support Sasha Levin
2012-06-06 13:24 ` Avi Kivity
2012-06-08 13:20 ` Sasha Levin
2012-06-08 16:06 ` Dan Magenheimer
2012-06-11 11:17 ` Avi Kivity [this message]
2012-06-11 8:09 ` Avi Kivity
2012-06-11 10:26 ` Sasha Levin
2012-06-11 11:45 ` Avi Kivity
2012-06-11 15:44 ` Dan Magenheimer
2012-06-11 17:06 ` Avi Kivity
2012-06-11 19:25 ` Sasha Levin
2012-06-11 19:56 ` Sasha Levin
2012-06-12 11:46 ` Avi Kivity
2012-06-12 11:58 ` Gleb Natapov
2012-06-12 12:01 ` Avi Kivity
2012-06-12 10:12 ` Avi Kivity
2012-06-12 1:18 ` Dan Magenheimer
2012-06-12 10:09 ` Avi Kivity
2012-06-12 16:40 ` Dan Magenheimer
2012-06-12 17:54 ` Avi Kivity
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