fuse: {io-uring} Prefer the current core over mapping#93
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bsbernd merged 1 commit intoredfs-ubuntu-noble-6.8.0-58.60from Feb 13, 2026
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Mapping might point to a totally different core due to
random assignment. For performance using the current
core might be beneficial
Example (with core binding)
unpatched WRITE: bw=841MiB/s
patched WRITE: bw=1363MiB/s
With
fio --name=test --ioengine=psync --direct=1 \
--rw=write --bs=1M --iodepth=1 --numjobs=1 \
--filename_format=/redfs/testfile.\$jobnum --size=100G \
--thread --create_on_open=1 --runtime=30s --cpus_allowed=1
In order to get the good number `--cpus_allowed=1` is needed.
This could be improved by a future change that avoids
cpu migration in fuse_request_end() on wake_up() call.
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Mapping might point to a totally different core due to random assignment. For performance using the current core might be beneficial
Example (with core binding)
unpatched WRITE: bw=841MiB/s
patched WRITE: bw=1363MiB/s
With
fio --name=test --ioengine=psync --direct=1
--rw=write --bs=1M --iodepth=1 --numjobs=1
--filename_format=/redfs/testfile.$jobnum --size=100G
--thread --create_on_open=1 --runtime=30s --cpus_allowed=1
In order to get the good number
--cpus_allowed=1is needed. This could be improved by a future change that avoids cpu migration in fuse_request_end() on wake_up() call.