[Qemu-devel] slow HD performance in mingw

[Qemu-devel] slow HD performance in mingw

[Roy Tam]

Hello all,

I noticed that QEMU(both 1.2.1 and git head) acts very slow when
accessing HD. I wonder if it is a fault in my build environment?

Spec:
Windows XP SP3
gcc-4.6.2
binutils-2.22.51.20120114
SDL-1.2.14
glib-2.28.8 (configure line: CFLAGS="-Os -I/mingw/include" LDFLAGS=-s
./configure --prefix=/mingw --disable-shared --enable-static
--enable-threads --with-threads=win32 --with-libiconv=native
--disable-gtk-doc-html --disable-fam --disable-xattr --disable-selinux
--disable-debug )

configure line: ./configure --target-list="i386-softmmu"
--audio-drv-list=sdl
--audio-card-list="ac97,es1370,sb16,cs4231a,adlib,gus,hda"
--disable-linux-aio --disable-vnc-jpeg --with-coroutine=windows
--extra-cflags="-pipe"


Regards,
Roy

Re: [Qemu-devel] slow HD performance in mingw

[Roy Tam]

2012/11/30 Roy Tam <roytam@gmail.com>:
> Hello all,
>
> I noticed that QEMU(both 1.2.1 and git head) acts very slow when
> accessing HD. I wonder if it is a fault in my build environment?
>

and in same environment, I can see the speed decreases when version bumps:
http://roy.dnsd.me/qemu-0.15.1.png
http://roy.dnsd.me/qemu-1.0.50.png
http://roy.dnsd.me/qemu-1.0.91.png
http://roy.dnsd.me/qemu-1.2.91.png

> Spec:
> Windows XP SP3
> gcc-4.6.2
> binutils-2.22.51.20120114
> SDL-1.2.14
> glib-2.28.8 (configure line: CFLAGS="-Os -I/mingw/include" LDFLAGS=-s
> ./configure --prefix=/mingw --disable-shared --enable-static
> --enable-threads --with-threads=win32 --with-libiconv=native
> --disable-gtk-doc-html --disable-fam --disable-xattr --disable-selinux
> --disable-debug )
>
> configure line: ./configure --target-list="i386-softmmu"
> --audio-drv-list=sdl
> --audio-card-list="ac97,es1370,sb16,cs4231a,adlib,gus,hda"
> --disable-linux-aio --disable-vnc-jpeg --with-coroutine=windows
> --extra-cflags="-pipe"
>
>
> Regards,
> Roy

Re: [Qemu-devel] slow HD performance in mingw

[Kevin Wolf]

Am 30.11.2012 16:36, schrieb Roy Tam:
> 2012/11/30 Roy Tam <roytam@gmail.com>:
>> Hello all,
>>
>> I noticed that QEMU(both 1.2.1 and git head) acts very slow when
>> accessing HD. I wonder if it is a fault in my build environment?
>>
> 
> and in same environment, I can see the speed decreases when version bumps:
> http://roy.dnsd.me/qemu-0.15.1.png
> http://roy.dnsd.me/qemu-1.0.50.png
> http://roy.dnsd.me/qemu-1.0.91.png
> http://roy.dnsd.me/qemu-1.2.91.png

Can you bisect the exact commits at which each of these degradation
steps happened?

Kevin