I have created a launchpad bug against qemu-kvm in Ubuntu.
https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/437473
Just re-iterating, my concern isn't so much performance, but integrity
of stock KVM configurations with server or other workloads that expect
sync fileIO requests to be honored and synchronous to the underlying
physical disk.
(That and ensuring that sanity reigns where a benchmark doesn't show a
guest operating 10 times faster than a host for the same test :).
Regards,
Matthew
-------- Original Message --------
Subject: Re: sync guest calls made async on host - SQLite performance
From: Avi Kivity <avi@xxxxxxxxxx>
To: RW <kvm@xxxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Date: 09/27/2009 07:37 AM
On 09/25/2009 10:00 AM, RW wrote:
I think ext3 with "data=writeback" in a KVM and KVM started
with "if=virtio,cache=none" is a little bit crazy. I don't know
if this is the case with current Ubuntu Alpha but it looks
like so.
It's not crazy, qemu bypasses the cache with cache=none so the ext3
data= setting is immaterial.
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