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author | Alexander Motin <mav@FreeBSD.org> | 2021-02-19 03:07:32 +0000 |
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committer | Alexander Motin <mav@FreeBSD.org> | 2021-02-19 03:29:38 +0000 |
commit | 812c9f48a2b7bccc31b2a6077b299822357832e4 (patch) | |
tree | 010235d080cc84effb1ee127a2b3dfd3f7f21e66 /sys/sys/devmap.h | |
parent | 4621c4f2fd179eff0923140da9af122c42dbe78b (diff) | |
download | src-812c9f48a2b7bccc31b2a6077b299822357832e4.tar.gz src-812c9f48a2b7bccc31b2a6077b299822357832e4.zip |
Save context switch per I/O for iSCSI and IOCTL frontends.
Introduce new CTL core KPI ctl_run(), preprocessing I/Os in the caller
context instead of scheduling another thread just for that. This call
may sleep, that is not acceptable for some frontends like the original
CAM/FC one, but iSCSI already has separate sleepable per-connection RX
threads, and another thread scheduling is mostly just a waste of time.
IOCTL frontend actually waits for the I/O completion in the caller
thread, so the use of another thread for this has even less sense.
With this change I can measure ~5% IOPS improvement on 4KB iSCSI I/Os
to ZFS.
MFC after: 1 month
Diffstat (limited to 'sys/sys/devmap.h')
0 files changed, 0 insertions, 0 deletions