[PATCH for-next v1 0/2] enable pcpu bio-cache for IRQ uring-passthru I/O

[Anuj Gupta]

This series extends bio pcpu caching for normal / IRQ-driven
uring-passthru I/Os. Earlier, only polled uring-passthru I/Os could
leverage bio-cache. After the series from Pavel[1], bio-cache can be
leveraged by normal / IRQ driven I/Os as well. t/io_uring with an Optane
SSD setup shows +7.21% for batches of 32 requests.

[1] https://lore.kernel.org/io-uring/cover.1666347703.git.asml.silence@gmail.com/

IRQ, 128/32/32, cache off

# taskset -c 0 t/io_uring -b512 -d128 -c32 -s32 -p0 -F1 -B1 -P0 -O0 -u1 -n1 /dev/ng0n1
submitter=0, tid=13207, file=/dev/ng0n1, node=-1
polled=0, fixedbufs=1/0, register_files=1, buffered=1, QD=128
Engine=io_uring, sq_ring=128, cq_ring=128
IOPS=3.05M, BW=1488MiB/s, IOS/call=32/31
IOPS=3.04M, BW=1483MiB/s, IOS/call=32/31
IOPS=3.03M, BW=1477MiB/s, IOS/call=32/32
IOPS=3.03M, BW=1481MiB/s, IOS/call=32/32
^CExiting on signal
Maximum IOPS=3.05M

IRQ, 128/32/32, cache on

# taskset -c 0 t/io_uring -b512 -d128 -c32 -s32 -p0 -F1 -B1 -P0 -O0 -u1 -n1 /dev/ng0n1
submitter=0, tid=6755, file=/dev/ng0n1, node=-1
polled=0, fixedbufs=1/0, register_files=1, buffered=1, QD=128
Engine=io_uring, sq_ring=128, cq_ring=128
IOPS=3.27M, BW=1596MiB/s, IOS/call=32/31
IOPS=3.27M, BW=1595MiB/s, IOS/call=32/32
IOPS=3.26M, BW=1592MiB/s, IOS/call=32/31
IOPS=3.26M, BW=1593MiB/s, IOS/call=32/32
^CExiting on signal
Maximum IOPS=3.27M

Anuj Gupta (2):
  nvme: set REQ_ALLOC_CACHE for uring-passthru request
  block: extend bio-cache for non-polled requests

 block/blk-map.c           | 6 ++----
 drivers/nvme/host/ioctl.c | 4 ++--
 2 files changed, 4 insertions(+), 6 deletions(-)

-- 
2.25.1