Re: [Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default

[Aurelien Jarno]

On Tue, Feb 08, 2011 at 04:08:28PM +0100, Aurelien Jarno wrote:
> Aurelien Jarno a écrit :
> > Paolo Bonzini a écrit :
> >> On 02/08/2011 12:15 PM, Aurelien Jarno wrote:
> >>> however
> >>> it should not be done ignoring all the*current*  drawbacks of the
> >>> iothread mode. We know them (at least for some of them), so let's try to
> >>> solve them.
> >> Let's also enumerate them.
> >>
> > 
> > From what I know:
> > - performance regression in TCG mode
> 
> I setup an x86_64 guest on an x86_64 host (Intel Xeon E5345). Nothing
> was running except the standard daemons and the CPU governor was set to
> "performance" on all CPU. I then compared the network performance using
> netperf in default mode, through a tap interface and a virtio nic. I got
> the following results (quite reproducible, std below 0.5):
> - without IO thread: 107.36 MB/s
> - with IO thread:     89.93 MB/s
> 

And the same test on the code from september 2009:
- without IO thread: 141.8 MB/s

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
address@hidden                 http://www.aurel32.net