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| author | Fam Zheng <famz@redhat.com> | 2018-01-16 14:08:55 +0800 |
|---|---|---|
| committer | Fam Zheng <famz@redhat.com> | 2018-02-08 09:22:03 +0800 |
| commit | bdd6a90a9e5fe22201dce84aea60ac08197e2c63 (patch) | |
| tree | 51510269cdaf1b43fadba613215f41066f8825f1 /block/io.c | |
| parent | 418026ca43bc2626db092d7558258f9594366f28 (diff) | |
| download | qemu-bdd6a90a9e5fe22201dce84aea60ac08197e2c63.zip qemu-bdd6a90a9e5fe22201dce84aea60ac08197e2c63.tar.gz qemu-bdd6a90a9e5fe22201dce84aea60ac08197e2c63.tar.bz2 | |
block: Add VFIO based NVMe driver
This is a new protocol driver that exclusively opens a host NVMe
controller through VFIO. It achieves better latency than linux-aio by
completely bypassing host kernel vfs/block layer.
$rw-$bs-$iodepth linux-aio nvme://
----------------------------------------
randread-4k-1 10.5k 21.6k
randread-512k-1 745 1591
randwrite-4k-1 30.7k 37.0k
randwrite-512k-1 1945 1980
(unit: IOPS)
The driver also integrates with the polling mechanism of iothread.
This patch is co-authored by Paolo and me.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <20180116060901.17413-4-famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Diffstat (limited to 'block/io.c')
0 files changed, 0 insertions, 0 deletions