[fedora-virt] performance regressions in Fedora 13?

[Kenneth Armstrong]

Thanks, I had actually reinstalled and used ext4 (I was already using
LVM) the other day, and my performance has improved tremendously.  I
had no idea that btrfs was that slow.  Thanks for the other tips
though.

-Kenny

On Sun, May 30, 2010 at 7:19 AM, Avi Kivity <avi at redhat.com> wrote:
> On 05/27/2010 08:29 PM, Kenneth Armstrong wrote:
>>
>> Something that occured to me is that I am using BTRFS with Fedora 13
>> instead of EXT4, which is what I was using under F11.  I was under the
>> impression that BTRFS was actually a bit quicker than EXT4 though.
>>
>>
>
>
> btrfs is slower than ext4, especially with cache=writethrough.  Try
> cache=writeback to recover some of the performance loss.
>
> ext4 is slower as well due to defaulting to barrier=1.  barrier=0 will be
> faster at the cost of data integrity.
>
> For best performance, use LVM and cache=off.
>
> --
> error compiling committee.c: too many arguments to function
>
>