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[Qemu-devel] Re: BTRFS: Unbelievably slow with kvm/qemu

From: Giangiacomo Mariotti
Subject: [Qemu-devel] Re: BTRFS: Unbelievably slow with kvm/qemu
Date: Mon, 12 Jul 2010 15:34:44 +0200

On Mon, Jul 12, 2010 at 9:09 AM, Michael Tokarev <address@hidden> wrote:
> This looks quite similar to a problem with ext4 and O_SYNC which I
> reported earlier but no one cared to answer (or read?) - there:
> http://permalink.gmane.org/gmane.linux.file-systems/42758
> (sent to qemu-devel and linux-fsdevel lists - Cc'd too).  You can
> try a few other options, esp. cache=none and re-writing some guest
> files to verify.
> /mjt
Either way, changing to cache=none I suspect wouldn't tell me much,
because if it's as slow as before, it's still unusable and if instead
it's even slower, well it'd be even more unusable, so I wouldn't be
able to tell the difference. What I can say for certain is that with
the exact same virtual hd file, same options, same system, but on an
ext3 fs there's no problem at all, on a Btrfs is not just slower, it
takes ages.


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