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RE: [Xen-devel] qemu-dm performance

To: "Steven Smith" <sos22-xen@xxxxxxxxxxxxx>
Subject: RE: [Xen-devel] qemu-dm performance
From: "McAfee, Tommie M" <Tommie.McAfee@xxxxxxxxxx>
Date: Fri, 22 Sep 2006 14:58:21 -0400
Cc: Anthony Liguori <aliguori@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, sos22@xxxxxxxxxxxxx, "Dugger, Donald D" <donald.d.dugger@xxxxxxxxx>
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Thread-topic: [Xen-devel] qemu-dm performance

Thanks a lot, this fix does reduce qemu overhead.

Also, while testing I noticed a small bug with vncviewer using a
sles9sp3 guest.  My initial attempt to view a guest causes vnc to render
a small window that doesn't respond to mouse movements.  I have to close
this window and then start the vncviewer again to get a resized and
usable window.  I'm only seeing this on my first attempt to view the
guest.  Any suggestions?

Thx again for your help,

T. McAfee
Xen Testing

-----Original Message-----
From: Steven Smith [mailto:sos22@xxxxxxxxxxxxxxxx] On Behalf Of Steven
Sent: Thursday, September 21, 2006 3:23 PM
To: McAfee, Tommie M
Cc: Dugger, Donald D; Anthony Liguori; xen-devel@xxxxxxxxxxxxxxxxxxx;
Subject: Re: [Xen-devel] qemu-dm performance

> >Deleting this function should result in a blank VGA screen for your
> guest,
> I not sure why but I'm not seeing this.  Here is what how I commented
> out vram_dirty (as shown in gdb):
> 1563        for (y = 0; y < s->vram_size; y += TARGET_PAGE_SIZE){
> 1564            /*if (vram_dirty(s, y, TARGET_PAGE_SIZE))
> 1565                cpu_physical_memory_set_dirty(s->vram_offset + y);
> */
> 1566        }
It turns out that there was a bug a little later on which meant that
the dirty bits were never actually cleared.  Fixing this seems to have
fairly drastically reduced qemu overhead.  The fix is now present in



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