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| author | Olivier Langlois <olivier@trillion01.com> | 2022-03-08 17:17:26 -0500 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-03-10 09:18:30 -0700 |
| commit | adc8682ec69012b68d5ab7123e246d2ad9a6f94b (patch) | |
| tree | 7d701cfbb64225cbe40b30802f97641bd41a0a1a /fs/stat.c | |
| parent | 950e79dd73131a263b2dd7fec521ceafd28d2724 (diff) | |
io_uring: Add support for napi_busy_poll
The sqpoll thread can be used for performing the napi busy poll in a
similar way that it does io polling for file systems supporting direct
access bypassing the page cache.
The other way that io_uring can be used for napi busy poll is by
calling io_uring_enter() to get events.
If the user specify a timeout value, it is distributed between polling
and sleeping by using the systemwide setting
/proc/sys/net/core/busy_poll.
The changes have been tested with this program:
https://github.com/lano1106/io_uring_udp_ping
and the result is:
Without sqpoll:
NAPI busy loop disabled:
rtt min/avg/max/mdev = 40.631/42.050/58.667/1.547 us
NAPI busy loop enabled:
rtt min/avg/max/mdev = 30.619/31.753/61.433/1.456 us
With sqpoll:
NAPI busy loop disabled:
rtt min/avg/max/mdev = 42.087/44.438/59.508/1.533 us
NAPI busy loop enabled:
rtt min/avg/max/mdev = 35.779/37.347/52.201/0.924 us
Co-developed-by: Hao Xu <haoxu@linux.alibaba.com>
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Signed-off-by: Olivier Langlois <olivier@trillion01.com>
Link: https://lore.kernel.org/r/810bd9408ffc510ff08269e78dca9df4af0b9e4e.1646777484.git.olivier@trillion01.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/stat.c')
0 files changed, 0 insertions, 0 deletions