Re: [Qemu-devel] [PATCH 00/10] AHCI emulation support v2

[Alexander Graf]

On 19.11.2010, at 10:12, Stefan Hajnoczi wrote:

> On Thu, Nov 18, 2010 at 11:24 PM, Alexander Graf <address@hidden> wrote:
>> linux-uztg:~ # dd if=/dev/sdc of=/dev/null bs=10M count=300 iflag=direct
> 
> That's a big block size.  bs=8k is interesting too because we see the
> per-request overhead.  Since IDE, SATA, and virtio have different
> hardware interfaces that the guest drives we may see an interesting
> picture with small block sizes.

IDE: 60MB/s
SATA: 100MB/s
virtio: 120 MB/s

I had a pretty big jitter on that one though, with SATA going between 80MB and 
120MB :). But overall, it's the same picture as the one with big block sizes.


Alex