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| author | Jens Axboe <axboe@kernel.dk> | 2018-01-10 19:46:39 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-01-10 19:47:58 +0100 |
| commit | 7c3fb70f0341f9d924818e648906774921f4bcb3 (patch) | |
| tree | 6f6eac29e2d0312784dc8e568c303e02391f3726 /block/blk-map.c | |
| parent | block: convert REQ_ATOM_COMPLETE to stealing rq->__deadline bit (diff) | |
| download | linux-7c3fb70f0341f9d924818e648906774921f4bcb3.tar.xz linux-7c3fb70f0341f9d924818e648906774921f4bcb3.zip | |
block: rearrange a few request fields for better cache layout
Move completion related items (like the call single data) near the
end of the struct, instead of mixing them in with the initial
queueing related fields.
Move queuelist below the bio structures. Then we have all
queueing related bits in the first cache line.
This yields a 1.5-2% increase in IOPS for a null_blk test, both for
sync and for high thread count access. Sync test goes form 975K to
992K, 32-thread case from 20.8M to 21.2M IOPS.
Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-map.c')
0 files changed, 0 insertions, 0 deletions