On Sat, Feb 21, 2015 at 06:59:23PM +0000, Greg Langford wrote: > 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. Please post the dd command-line and the QEMU command-lines for launching the Linux and FreeBSD guests. Stefan
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