From mboxrd@z Thu Jan 1 00:00:00 1970 From: piaojun Message-ID: <5D56248A.5040000@huawei.com> Date: Fri, 16 Aug 2019 11:35:38 +0800 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Subject: [Virtio-fs] [PATCH v6 0/2] virtiofsd: Improve io bandwidth by replacing pwrite with pwritev List-Id: Development discussions about virtio-fs List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: virtio-fs@redhat.com >>From my test, write bandwidth will be improved greatly by replacing pwrite with pwritev, and the test result as below: --- pwrite: # fio -direct=1 -time_based -iodepth=64 -rw=randwrite -ioengine=libaio -bs=1M -size=1G -numjob=16 -runtime=30 -group_reporting -name=file -filename=/mnt/virtiofs/file file: (g=0): rw=randwrite, bs=1M-1M/1M-1M/1M-1M, ioengine=libaio, iodepth=64 ... fio-2.13 Starting 16 processes Jobs: 16 (f=16): [w(16)] [100.0% done] [0KB/886.0MB/0KB /s] [0/886/0 iops] [eta 00m:00s] file: (groupid=0, jobs=16): err= 0: pid=5799: Tue Aug 6 18:48:26 2019 write: io=26881MB, bw=916988KB/s, iops=895, runt= 30018msec pwritev: # fio -direct=1 -time_based -iodepth=64 -rw=randwrite -ioengine=libaio -bs=1M -size=1G -numjob=16 -runtime=30 -group_reporting -name=file -filename=/mnt/virtiofs/file file: (g=0): rw=randwrite, bs=1M-1M/1M-1M/1M-1M, ioengine=libaio, iodepth=64 ... fio-2.13 Starting 16 processes Jobs: 16 (f=16): [w(16)] [100.0% done] [0KB/1793MB/0KB /s] [0/1793/0 iops] [eta 00m:00s] file: (groupid=0, jobs=16): err= 0: pid=6328: Tue Aug 6 18:22:17 2019 write: io=52775MB, bw=1758.7MB/s, iops=1758, runt= 30009msec --- This patch introduces writev and pwritev for lo_write_buf(). v2 - Split into two patches - Add the lost flags support, such as FUSE_BUF_PHYS_ADDR v3 - use git send-email to make the patch set in one thread - move fuse_buf_writev() into fuse_buf_copy() - use writev for the src buffers when they're alread already mapped by the daemon process - use calloc to replace malloc - set res 0 if writev() returns 0 v4 - iterate from in_buf->buf[0] rather than buf[1] - optimize the code to make it more elegant v5 - add some check for preconditions of the buffers v6 - add more preconditions before fuse_buf_writev() to make it generic - skip the empty bufs to avoid writev failed in direct io mode Jun Piao (2): add definition of fuse_buf_writev(). use fuse_buf_writev to replace fuse_buf_write for better performance Signed-off-by: Jun Piao --- buffer.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++++- seccomp.c | 2 ++ 2 files changed, 53 insertions(+), 1 deletion(-) --