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| author | Nitesh Shetty <nj.shetty@samsung.com> | 2025-04-17 10:32:34 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2025-04-17 07:42:14 -0600 |
| commit | 80c7378f94cf193cb3bd2101bbcd5aea78d0e211 (patch) | |
| tree | 9e9565cdcb473a4f827e504bef795e6b2a1ebe22 /rust/helpers/io.c | |
| parent | 59852ebad954c8a3ac8b746930c2ea60febe797a (diff) | |
| download | linux-80c7378f94cf193cb3bd2101bbcd5aea78d0e211.tar.gz linux-80c7378f94cf193cb3bd2101bbcd5aea78d0e211.tar.bz2 linux-80c7378f94cf193cb3bd2101bbcd5aea78d0e211.zip | |
io_uring/rsrc: send exact nr_segs for fixed buffer
Sending exact nr_segs, avoids bio split check and processing in
block layer, which takes around 5%[1] of overall CPU utilization.
In our setup, we see overall improvement of IOPS from 7.15M to 7.65M [2]
and 5% less CPU utilization.
[1]
3.52% io_uring [kernel.kallsyms] [k] bio_split_rw_at
1.42% io_uring [kernel.kallsyms] [k] bio_split_rw
0.62% io_uring [kernel.kallsyms] [k] bio_submit_split
[2]
sudo taskset -c 0,1 ./t/io_uring -b512 -d128 -c32 -s32 -p1 -F1 -B1 -n2
-r4 /dev/nvme0n1 /dev/nvme1n1
Signed-off-by: Nitesh Shetty <nj.shetty@samsung.com>
[Pavel: fixed for kbuf, rebased and reworked on top of cleanups]
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/7a1a49a8d053bd617c244291d63dbfbc07afde36.1744882081.git.asml.silence@gmail.com
[axboe: fold in fix factoring in buf reg offset]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'rust/helpers/io.c')
0 files changed, 0 insertions, 0 deletions