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..., ioengine=libaio, iodepth=64 ... randrw: (g=0): rw=randrw, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=64 Starting 8 processes randrw: (groupid=0, jobs=1): err= 0: pid=7155 read : io=384MB, bw=62,934KB/s, iops=15,733, runt= 6243msec slat (usec): min=4, max=11,681, avg=167.00, stdev=448.35 clat (usec): min=3, max=19,552, avg=2217.48, stdev=1367.27 bw (KB/s) : min= 0, max=70143, per=1.27%, avg=6362.85, stdev=19236.22 write: io=128MB, bw=21,046KB/s, iops=5,261, runt= 6243msec slat (usec): min=4, max=11,678, avg=164.73, stdev=442.99 clat (usec): min=11, max=19,552, avg=2229...

..., ioengine=libaio, iodepth=64 ... randrw: (g=0): rw=randrw, bs=4K-4K/4K-4K, ioengine=libaio, iodepth=64 Starting 8 processes randrw: (groupid=0, jobs=1): err= 0: pid=7155 read : io=384MB, bw=62,934KB/s, iops=15,733, runt= 6243msec slat (usec): min=4, max=11,681, avg=167.00, stdev=448.35 clat (usec): min=3, max=19,552, avg=2217.48, stdev=1367.27 bw (KB/s) : min= 0, max=70143, per=1.27%, avg=6362.85, stdev=19236.22 write: io=128MB, bw=21,046KB/s, iops=5,261, runt= 6243msec slat (usec): min=4, max=11,678, avg=164.73, stdev=442.99 clat (usec): min=11, max=19,552, avg=2229...

...est: same as host kernel Average 3 runs: with locked kick read iops=119907.50 bw=59954.00 runt=35018.50 io=2048.00 write iops=217187.00 bw=108594.00 runt=19312.00 io=2048.00 read iops=33948.00 bw=16974.50 runt=186820.50 io=3095.70 write iops=35014.00 bw=17507.50 runt=181151.00 io=3095.70 clat (usec) max=3484.10 avg=121085.38 stdev=174416.11 min=0.00 clat (usec) max=3438.30 avg=59863.35 stdev=116607.69 min=0.00 clat (usec) max=3745.65 avg=454501.30 stdev=332699.00 min=0.00 clat (usec) max=4089.75 avg=442374.99 stdev=304874.62 min=0.00 cpu sys=615.12 majf=24080.50 ctx=...

...est: same as host kernel Average 3 runs: with locked kick read iops=119907.50 bw=59954.00 runt=35018.50 io=2048.00 write iops=217187.00 bw=108594.00 runt=19312.00 io=2048.00 read iops=33948.00 bw=16974.50 runt=186820.50 io=3095.70 write iops=35014.00 bw=17507.50 runt=181151.00 io=3095.70 clat (usec) max=3484.10 avg=121085.38 stdev=174416.11 min=0.00 clat (usec) max=3438.30 avg=59863.35 stdev=116607.69 min=0.00 clat (usec) max=3745.65 avg=454501.30 stdev=332699.00 min=0.00 clat (usec) max=4089.75 avg=442374.99 stdev=304874.62 min=0.00 cpu sys=615.12 majf=24080.50 ctx=...

Hi, Jens & Rusty This version is rebased against linux-next which resolves the conflict with Paolo Bonzini's 'virtio-blk: allow toggling host cache between writeback and writethrough' patch. Patch 1/3 and 2/3 applies on linus's master as well. Since Rusty will pick up patch 3/3 so the changes to block core (adding blk_bio_map_sg()) will have a user. Jens, could you please

Hi, Jens & Rusty This version is rebased against linux-next which resolves the conflict with Paolo Bonzini's 'virtio-blk: allow toggling host cache between writeback and writethrough' patch. Patch 1/3 and 2/3 applies on linus's master as well. Since Rusty will pick up patch 3/3 so the changes to block core (adding blk_bio_map_sg()) will have a user. Jens, could you please

Hi, all Changes in v7: - Using vbr->flags to trace request type - Dropped unnecessary struct virtio_blk *vblk parameter - Reuse struct virtblk_req in bio done function - Added performance data on normal SATA device and the reason why make it optional Fio test shows bio-based IO path gives the following performance improvement: 1) Ramdisk device With bio-based IO path, sequential

Hi, all Changes in v7: - Using vbr->flags to trace request type - Dropped unnecessary struct virtio_blk *vblk parameter - Reuse struct virtblk_req in bio done function - Added performance data on normal SATA device and the reason why make it optional Fio test shows bio-based IO path gives the following performance improvement: 1) Ramdisk device With bio-based IO path, sequential

...[m(5),_(1),m(8),f(1),_(1)] [33.9% done] [1000KB/440KB/0KB /s] [125/55/0 iops] [eta 01m:59s] fio-test: (groupid=0, jobs=16): err= 0: pid=2051: Tue Oct 10 16:51:46 2017 read : io=43392KB, bw=733103B/s, iops=89, runt= 60610msec slat (usec): min=14, max=1992.5K, avg=177873.67, stdev=382294.06 clat (usec): min=768, max=6016.8K, avg=1871390.57, stdev=1082220.06 lat (usec): min=872, max=6630.6K, avg=2049264.23, stdev=1158405.41 clat percentiles (msec): | 1.00th=[ 20], 5.00th=[ 208], 10.00th=[ 457], 20.00th=[ 873], | 30.00th=[ 1237], 40.00th=[ 1516], 50.00th=[ 1795], 60...

This patchset implements bio-based IO path for virito-blk to improve performance. Fio test shows bio-based IO path gives the following performance improvement: 1) Ramdisk device With bio-based IO path, sequential read/write, random read/write IOPS boost : 28%, 24%, 21%, 16% Latency improvement: 32%, 17%, 21%, 16% 2) Fusion IO device With bio-based IO path, sequential

This patchset implements bio-based IO path for virito-blk to improve performance. Fio test shows bio-based IO path gives the following performance improvement: 1) Ramdisk device With bio-based IO path, sequential read/write, random read/write IOPS boost : 28%, 24%, 21%, 16% Latency improvement: 32%, 17%, 21%, 16% 2) Fusion IO device With bio-based IO path, sequential

...] [33.9% done] [1000KB/440KB/0KB > /s] [125/55/0 iops] [eta 01m:59s] > fio-test: (groupid=0, jobs=16): err= 0: pid=2051: Tue Oct 10 16:51:46 2017 > read : io=43392KB, bw=733103B/s, iops=89, runt= 60610msec > slat (usec): min=14, max=1992.5K, avg=177873.67, stdev=382294.06 > clat (usec): min=768, max=6016.8K, avg=1871390.57, stdev=1082220.06 > lat (usec): min=872, max=6630.6K, avg=2049264.23, stdev=1158405.41 > clat percentiles (msec): > | 1.00th=[ 20], 5.00th=[ 208], 10.00th=[ 457], 20.00th=[ 873], > | 30.00th=[ 1237], 40.00th=[ 1516],...

Hi, all This version reworked on REQ_FLUSH and REQ_FUA support as suggested by Christoph and dropped the block core bits since Jens has picked them up. Fio test shows bio-based IO path gives the following performance improvement: 1) Ramdisk device With bio-based IO path, sequential read/write, random read/write IOPS boost : 28%, 24%, 21%, 16% Latency improvement: 32%,

Hi, all This version reworked on REQ_FLUSH and REQ_FUA support as suggested by Christoph and dropped the block core bits since Jens has picked them up. Fio test shows bio-based IO path gives the following performance improvement: 1) Ramdisk device With bio-based IO path, sequential read/write, random read/write IOPS boost : 28%, 24%, 21%, 16% Latency improvement: 32%,

Hi folks, This version added REQ_FLUSH and REQ_FUA support as suggested by Christoph and rebased against latest linus's tree. Jens, could you please consider picking up the dependencies 1/4 and 2/4 in your tree. Thanks! This patchset implements bio-based IO path for virito-blk to improve performance. Fio test shows bio-based IO path gives the following performance improvement: 1) Ramdisk

Hi folks, This version added REQ_FLUSH and REQ_FUA support as suggested by Christoph and rebased against latest linus's tree. Jens, could you please consider picking up the dependencies 1/4 and 2/4 in your tree. Thanks! This patchset implements bio-based IO path for virito-blk to improve performance. Fio test shows bio-based IO path gives the following performance improvement: 1) Ramdisk

This patchset implements bio-based IO path for virito-blk to improve performance. Fio test shows it gives, 28%, 24%, 21%, 16% IOPS boost and 32%, 17%, 21%, 16% latency improvement for sequential read/write, random read/write respectively. Asias He (2): block: Add blk_bio_map_sg() helper virtio-blk: Add bio-based IO path for virtio-blk block/blk-merge.c | 63 ++++++++++++++

This patchset implements bio-based IO path for virito-blk to improve performance. Fio test shows it gives, 28%, 24%, 21%, 16% IOPS boost and 32%, 17%, 21%, 16% latency improvement for sequential read/write, random read/write respectively. Asias He (2): block: Add blk_bio_map_sg() helper virtio-blk: Add bio-based IO path for virtio-blk block/blk-merge.c | 63 ++++++++++++++

This patchset implements bio-based IO path for virito-blk to improve performance. Fio test shows it gives, 28%, 24%, 21%, 16% IOPS boost and 32%, 17%, 21%, 16% latency improvement for sequential read/write, random read/write respectively. Asias He (3): block: Introduce __blk_segment_map_sg() helper block: Add blk_bio_map_sg() helper virtio-blk: Add bio-based IO path for virtio-blk

This patchset implements bio-based IO path for virito-blk to improve performance. Fio test shows it gives, 28%, 24%, 21%, 16% IOPS boost and 32%, 17%, 21%, 16% latency improvement for sequential read/write, random read/write respectively. Asias He (3): block: Introduce __blk_segment_map_sg() helper block: Add blk_bio_map_sg() helper virtio-blk: Add bio-based IO path for virtio-blk