Performance enhancements
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b4 am [email protected]Versions newest first
- v1 Latest3 patches 30 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/3 | nvme/pci: Start request after doorbell ringdrivers/ | +1 | 12 replies | |
| 2/3 | nvme/pci: Remove cq_vector check in IO pathdrivers/ | +2 | 7 replies | |
| 3/3 | block: Polling completion performance optimizationfs/ | +4 | 11 replies |
Reviews trailers per patch
1 of 3 patches has a Reviewed-by or Acked-by.
| Patch | Jens Axboe | Sagi Grimberg |
|---|---|---|
| 1/3 | ||
| 2/3 | R-b | R-b |
| 3/3 |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH 0/3] Performance enhancements
A few IO micro-optimizations for IO polling and NVMe. I'm really working to close the performance gap with userspace drivers, and this gets me halfway there on latency. The fastest hardware I could get measured roundtrip read latency at 5usec with this series that was previously measuring 5.7usec.
Note with NVMe, you really need to crank up the interrupt coalescing to see the completion polling benefit.
Test pre-setup:
echo performance | tee /sys/devices/system/cpu/cpufreq/policy*/scaling_governor echo 0 > /sys/block/nvme0n1/queue/iostats
echo -1 > /sys/block/nvme0n1/queue/io_poll_delay
nvme set-feature /dev/nvme0 -f 8 -v 0x4ff
fio profile:
[global]
ioengine=pvsync2
rw=randread
norandommap
direct=1
bs=4k
hipri
[hi-pri]
filename=/dev/nvme0n1
cpus_allowed=2
Keith Busch (3):
nvme/pci: Start request after doorbell ring nvme/pci: Remove cq_vector check in IO path
block: Polling completion performance optimization
drivers/nvme/host/pci.c | 14 +++----------- fs/block_dev.c | 5 ++++- 2 files changed, 7 insertions(+), 12 deletions(-)
Signature · 1 line
2.13.6