Hello, Can someone running with virtio tell me if this is normal to have such a difference with dd between host and guest machine ? host dd is 500MB/s guest dd is 150MB/s All other questions are optionnal for now :D Thanks in advance, Benoit. PS: does replacing virtio with vhost and a more recent kvm would help ? On Wed, Oct 12, 2011 at 2:21 PM, benoit ROUSSELLE <brousselle@xxxxxxxxx> wrote: > Dear All, > > I am doing some disk io performance testing on the following environment: > Dell AMD R515 with: > - debian6 (2.6.32) on host and guests. > - raid1 mirror on a perc h700 > - lvm used to create virtual disks volumes > - virtio enabled per default on 2.6.32 and used for nic and disk drivers > > For my tests i use the following command: > dd bs=6M count=500 if=/dev/zero of=toto.txt > > On local host i get 500MB/s > On 1 guest 150MB/s > On 2 guests in parallel 70MB/s > > Here are my questions: > 1) Is this the expected behavior ? > 2) What can i do next to improve local disk performance ? > 3) If i want to do shared storage with best disk io performance, what > kind of storage should i use ? > > Thanks in advance :D > Benoit. > -- 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
