Hi Paolo, On Mon, Dec 14, 2015 at 6:31 PM, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > > On 18/06/2014 06:04, Ming Lei wrote: >> For virtio-blk, I don't think it is always better to take more queues, and >> we need to leverage below things in host side: >> >> - host storage top performance, generally it reaches that with more >> than 1 jobs with libaio(suppose it is N, so basically we can use N >> iothread per device in qemu to try to get top performance) >> >> - iothreads' loading(if iothreads are at full loading, increasing >> queues doesn't help at all) >> >> In my test, I only use the current per-dev iothread(x-dataplane) >> in qemu to handle 2 vqs' notification and precess all I/O from >> the 2 vqs, and looks it can improve IOPS by ~30%. >> >> For virtio-scsi, the current usage doesn't make full use of blk-mq's >> advantage too because only one vq is active at the same time, so I >> guess the multi vqs' benefit won't be very much and I'd like to post >> patches to support that first, then provide test data with >> more queues(8, 16). > > Hi Ming Lei, > > would you like to repost these patches now that MQ support is in the kernel? > > Also, I changed my mind about moving linux-aio to AioContext. I now > think it's a good idea, because it limits the number of io_getevents > syscalls. O:-) So I would be happy to review your patches for that as well. OK, I try to figure out a new version, and it might take a while since it is close to festival season, :-) Thanks, _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
