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

[John Coiner]

Christian MICHON wrote:
> hmmm....
>
> 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).

(1) is a parallel task -- 'tar' and 'bunzip2' run concurrently. You see 
a benefit here when one process can use the CPU while the other is 
blocked waiting for IO.

(2) is a serial task. It can't benefit from non-blocking IO. 'make -j 2' 
should benefit, in cases where the host file cache is cold.

-- john