On Sat, Feb 21, 2015 at 7:59 PM, Greg Langford <greg@xxxxxxxxxxx> wrote: > Good Evening, Hi Greg, > > I am running CentOS 6.6 x86_64 as a KVM host and have a number of > guests running. > > After some experimenting I have noticed something curious, FreeBSD > disk performance seems to be just over half of that of a Linux guest > with an identical configuration. > > From my understanding virtio is included in FreeBSD 10.0 onwards. > > My CentOS guest has approx 130MB/s when using dd to read /dev/zero and > write it to a file on the guest file system. This is about the same > when doing the same on the hypervisor it's self. The stats are gained > using iotop on the hypervisor while the test is performed. > > However the FreeBSD guest gets about 70MB/s maximum when performing > the same test and is running FreeBSD 10.1 > > Has anyone seen this before, is it a known issue or expected > behaviour? I have been scratching my head about it for a number of > days now. There have been some performance improvements to the FreeBSD virtio-blk driver in -CURRENT: https://github.com/freebsd/freebsd/commit/6e8ba9083acb Maybe these help? > > Best Regards, > Greg Langford Kind regards, Ruben Kerkhof -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
