Re: [Xen-ia64-devel] [PATCH] Fix unaligned reference of QEMU

[Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>]

Hi Duan,

I think that you should post the patch to xen-devel too.

Best regards,
 Kan

Tue, 21 Aug 2007 14:58:21 +0800, "Duan, Ronghui" wrote:

>Hi
>
>In current changeset.,qemu copy data uses memcpy_words, which copies 4
>bytes at once if the length is larger than 4. This causes unaligned
>reference and leads to a performance downgrade. The issue met in rtl8139
>emulator. This patch fixes it.
>
> 
>
>Send Package from guest
>
>Version                size           speed          time  
>
>Original                226MB     1.3MB/s        2:54
>
>memcpy              226MB     2.8MB/s        1:22
>
>Receive Package
>
>Version                size           speed         time  
>
>Original                226MB     1.7MB/s        2:10
>
>memcpy               226MB     6.0MB/s        38 s
>
> 
>
>Thanks
>
> 
>
>Signed-off-by: Duan Ronghui   Ronghui.duan@xxxxxxxxx
>
> 
>
> 
>
>
>-------------------------------text/plain-------------------------------
>_______________________________________________
>Xen-ia64-devel mailing list
>Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>http://lists.xensource.com/xen-ia64-devel


_______________________________________________
Xen-ia64-devel mailing list
Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ia64-devel