On 06/12/2012 08:53 AM, Alex wrote:
Matthew Hawn <steamraven <at> yahoo.com> writes:
What are the recommendations for running KVM images on BTRFS systems using
kernel 3.4? I saw older
posts on the web complaining about poor performance, but I know a lot of work
has gone into btrfs since then.
There also seemed to be the nocow option, but I didn't find anything that
said it actualy helped.
I don't think it is about the kernel version, but rather about choosing
the right option for KVM.
I am running KVM via libvirt on btrfs with lzo compression, autodefrag,
inode and space cache for quite some time. Yes, I did set nocow for the
directory with images. I have no proof that it actually helps with disk
images, but being set for the build directory my build time is down 5
minutes.
I used raw virtio images with no caching. I guess this is the key if we
talk about disk I/O. The performance looks fine, though I only use it
for testing.
The last time I tried to install WinXP on KVM it was a disaster. But I
guess I did not choose the right options, nor did I install virtio
drivers inside the guest.
VirtualBox still outperforms KVM on btrfs in my view.
best
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