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

[Aurelien Jarno]

On Mon, Feb 07, 2011 at 02:03:50PM -0200, Marcelo Tosatti wrote:
> On Mon, Feb 07, 2011 at 08:12:55AM -0200, Marcelo Tosatti wrote:
> > > > One more thing I didn't mention on the email-thread or on IRC is
> > > > that last time I checked, qemu with io-thread was performing
> > > > significantly slower than non io-thread builds. That was with
> > > > TCG emulation (not kvm). Somewhere between 5 - 10% slower, IIRC.
> > 
> > Can you recall what was the test ?
> > 

It's also something I've seen using network transfer in guest. IIRC the
biggest slowdown was using the smc91c111 card under qemu-system-arm
where it was about 20% slower. Other cards on other architectures (I
remember testing powerpc, mips and sh4) are more in the 5 to 10 % area.

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