Re: [Xen-devel] qemu-dm performance

[Steven Smith <sos22-xen@xxxxxxxxxxxxx>]

> >Deleting this function should result in a blank VGA screen for your HVM
> 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
xen-unstable.

Thanks,

Steven.

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