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| author | Yu Kuai <yukuai3@huawei.com> | 2025-02-27 15:16:57 +0300 |
|---|---|---|
| committer | Yu Kuai <yukuai@kernel.org> | 2025-03-04 19:32:22 +0300 |
| commit | e879a0d9cb086c8e52ce6c04e5bfa63825a6213c (patch) | |
| tree | 1478b060a0adb3d370a54df1137e235e247bfb50 /tools/perf/scripts/python/parallel-perf.py | |
| parent | 1320fe874175fac395fa693195db68b2001c4d8f (diff) | |
| download | linux-e879a0d9cb086c8e52ce6c04e5bfa63825a6213c.tar.xz | |
md/raid1,raid10: don't ignore IO flags
If blk-wbt is enabled by default, it's found that raid write performance
is quite bad because all IO are throttled by wbt of underlying disks,
due to flag REQ_IDLE is ignored. And turns out this behaviour exist since
blk-wbt is introduced.
Other than REQ_IDLE, other flags should not be ignored as well, for
example REQ_META can be set for filesystems, clearing it can cause priority
reverse problems; And REQ_NOWAIT should not be cleared as well, because
io will wait instead of failing directly in underlying disks.
Fix those problems by keep IO flags from master bio.
Fises: f51d46d0e7cb ("md: add support for REQ_NOWAIT")
Fixes: e34cbd307477 ("blk-wbt: add general throttling mechanism")
Fixes: 5404bc7a87b9 ("[PATCH] Allow file systems to differentiate between data and meta reads")
Link: https://lore.kernel.org/linux-raid/20250227121657.832356-1-yukuai1@huaweicloud.com
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Diffstat (limited to 'tools/perf/scripts/python/parallel-perf.py')
0 files changed, 0 insertions, 0 deletions