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Re: [Qemu-devel] [patch] non-blocking disk IO

From: Christian MICHON
Subject: Re: [Qemu-devel] [patch] non-blocking disk IO
Date: Tue, 4 Oct 2005 13:19:18 +0200


the static binary crashes, the one with ptreadGC2.dll is ok.

What I tried to measure, on windows host, kqemu-0.7.2
loaded, was:
(1) tar -jxf linux-2.6.10.tar.bz2
(2) make allnoconfig; make

I confirm ~18% speed improvement in case (1), but no change
more or less for case (2). I believe maybe someone with a
windows host SMP could get different figures. If so, please
update these accordingly and let the list know.

Indeed, threading on a busy single CPU doesn't make it faster.
A kernel compilation with kqemu makes full use of the CPU. :(

I think we'll benefit mostly when copying files or setup OSes when
the CPU is quite in IDLE state. I've no figures without kqemu yet.

At least, it's a good start for speed improvement.
Thanks for the patch! :)

On 10/4/05, Christian MICHON <address@hidden> wrote:
> indeed, this was a quick and dirty hack :)
> I just managed to compile pthreadGC2 statically...
> pthread.h has to be modified to include extra
> PTW32_STATIC_LIB info, like this:
> #define PTW32_VERSION 2,6,0,0
> #define PTW32_VERSION_STRING "2, 6, 0, 0\0"
> #define PTW32_STATIC_LIB 1
> I'll test it later today and will report realistic benchmarks
> on windows hosts.


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