On Thu, Feb 09, 2012 at 08:13:52AM +0100, Paolo Bonzini wrote: > On 02/09/2012 06:46 AM, Hu Tao wrote: > >>>> >I've re-tested today, with host kernel 2.6.35.6-45.fc14.x86_64, > >>>> >2.6.32-71.el6.x86_64, 3.1.0 and 3.3.0-rc1+, qemu version and guest > >>>> >configuration remain the same, including guest kernel. It apears > >>>> >that the problem appears only when the host kernel version is 3.1.0. > >Sorry, forget about the kernel versions. With very heavy IO load, it's > >easy to reproduce the problem. In my case, 300 disks were attached to a > >virtio-scsi HBA, and 300 dd processes were launched at the same time, > >each for a disk. > > Yes, we're not yet optimizing for _that_ kind of scalability. :) > That raw works is already surprising enough to me!
Well, I'd like to say thanks for your works on virtio-scsi! > > What disk was it? Can you try on an SSD? A Hitachi HDS721010CLA332, SATA II, 7200rpm. I'm afraid I can't test on SSD since I have no SSD on hand.(and I don't think I'll have a SSD in the near future :| ) -- Thanks, Hu Tao
