lkml.org 
[lkml]   [2010]   [Apr]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: VM performance issue in KVM guests.
On 04/15/2010 04:33 PM, Peter Zijlstra wrote:
> On Thu, 2010-04-15 at 11:18 +0300, Avi Kivity wrote:
>
>> Certainly that has even greater potential for Linux guests. Note that
>> we spin on mutexes now, so we need to prevent preemption while the lock
>> owner is running.
>>
> either that, or disable spinning on (para) virt kernels.

What would you do instead?

Note we can't disable spinning on Windows or pre 2.6.36 kernels.

> Para virt
> kernels could possibly extend the thing by also checking to see if the
> owner's vcpu is running.
>

Certainly that's worth doing.

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.



\
 
 \ /
  Last update: 2010-04-17 21:07    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site