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From: Avi Kivity <avi@redhat.com>
To: Erik Jacobson <erikj@sgi.com>
Cc: kvm@vger.kernel.org
Subject: Re: slow guest performance with build load, looking for ideas
Date: Mon, 15 Jun 2009 17:24:14 +0300	[thread overview]
Message-ID: <4A36598E.5050300@redhat.com> (raw)
In-Reply-To: <20090615141542.GA17448@sgi.com>

On 06/15/2009 05:15 PM, Erik Jacobson wrote:
>> What is the host cpu type?  On pre-Nehalem/Barcelona processors kvm has
>> poor scalability in mmu intensive workloads like kernel builds.
>>      
>
> Thanks for getting back to me.
>
> Today is pretty booked but I'm going to go find a Nehalem system and try to
> run similar tests to compare.  I'll post my results to this thread.
>
> So if I understand what you're saying: best not to use kvm guests for build
> servers with pre-Nehalem processors.
>    

pre-Nehalem / pre-Barcelona, > 4 vcpus, yes.

> Both systems I used were pre-Nehalem.  Here is a cpuinfo snip from both
> systems I tested on:
>    

Yes, so I expect you're seeing contention on kvm->mmu_lock.

-- 
error compiling committee.c: too many arguments to function


  reply	other threads:[~2009-06-15 14:24 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-06-12 21:04 slow guest performance with build load, looking for ideas Erik Jacobson
2009-06-14  9:33 ` Avi Kivity
2009-06-15 14:15   ` Erik Jacobson
2009-06-15 14:24     ` Avi Kivity [this message]
2009-06-15 15:25       ` Michael Tokarev
2009-06-15 15:27         ` Avi Kivity
2009-06-16  7:03           ` Michael Tokarev
2009-06-16  8:07             ` Avi Kivity
2009-06-18 23:07   ` Erik Jacobson
2009-06-28 14:17     ` Avi Kivity
2009-06-28 19:05       ` Erik Jacobson
2009-06-28 21:28         ` Avi Kivity
2009-07-01 21:41           ` Erik Jacobson
2009-07-02  5:48             ` Avi Kivity
2009-07-02  9:41               ` Avi Kivity
2009-07-03 15:43                 ` Mark McLoughlin
2009-07-03 16:28                   ` Erik Jacobson
2009-07-09  2:36                   ` Erik Jacobson
2009-07-09  7:48                     ` Avi Kivity
2009-07-09 18:01                       ` Erik Jacobson
2009-07-12  8:38                         ` Avi Kivity
2009-07-16 12:20                           ` Jes Sorensen
2009-07-25 14:33                             ` Avi Kivity
2009-07-03 10:41   ` Matty
2009-07-05  8:07     ` Avi Kivity

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