On Sat, Dec 1, 2012 at 5:33 PM, Asias He <as...@redhat.com> wrote: > vhost-blk is an in-kernel virito-blk device accelerator. > > Due to lack of proper in-kernel AIO interface, this version converts > guest's I/O request to bio and use submit_bio() to submit I/O directly. > So this version any supports raw block device as guest's disk image, > e.g. /dev/sda, /dev/ram0. We can add file based image support to > vhost-blk once we have in-kernel AIO interface. There are some work in > progress for in-kernel AIO interface from Dave Kleikamp and Zach Brown: > > http://marc.info/?l=linux-fsdevel&m=133312234313122 > > Performance evaluation: > ----------------------------- > LKVM: Fio with libaio ioengine on 1 Fusion IO device > IOPS(k) Before After Improvement > seq-read 107 121 +13.0% > seq-write 130 179 +37.6% > rnd-read 102 122 +19.6% > rnd-write 125 159 +27.0% > > QEMU: Fio with libaio ioengine on 1 Fusion IO device > IOPS(k) Before After Improvement > seq-read 76 123 +61.8% > seq-write 139 173 +24.4% > rnd-read 73 120 +64.3% > rnd-write 75 156 +108.0% > > QEMU: Fio with libaio ioengine on 1 Ramdisk device > IOPS(k) Before After Improvement > seq-read 138 437 +216% > seq-write 191 436 +128% > rnd-read 137 426 +210% > rnd-write 140 415 +196% > > QEMU: Fio with libaio ioengine on 8 Ramdisk device > 50% read + 50% write > IOPS(k) Before After Improvement > randrw 64/64 189/189 +195%/+195% > > Userspace bits: > ----------------------------- > 1) LKVM > The latest vhost-blk userspace bits for kvm tool can be found here: > g...@github.com:asias/linux-kvm.git blk.vhost-blk > > 2) QEMU > The latest vhost-blk userspace prototype for QEMU can be found here: > g...@github.com:asias/qemu.git blk.vhost-blk > > Changes in v6: > - Use inline req_page_list to reduce kmalloc > - Switch to single thread model, thanks mst! > - Wait until requests fired before vhost_blk_flush to be finished > > Changes in v5: > - Do not assume the buffer layout > - Fix wakeup race > > Changes in v4: > - Mark req->status as userspace pointer > - Use __copy_to_user() instead of copy_to_user() in vhost_blk_set_status() > - Add if (need_resched()) schedule() in blk thread > - Kill vhost_blk_stop_vq() and move it into vhost_blk_stop() > - Use vq_err() instead of pr_warn() > - Fail un Unsupported request > - Add flush in vhost_blk_set_features() > > Changes in v3: > - Sending REQ_FLUSH bio instead of vfs_fsync, thanks Christoph! > - Check file passed by user is a raw block device file > > Acked-by: David S. Miller <da...@davemloft.net> > Signed-off-by: Asias He <as...@redhat.com>
Hi Asias, Is this still under development or stopped? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
