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(parent: 0498557) | patch
ahci: switch from 'threaded' to 'hardirq' interrupt handling
authorDan Williams <dan.j.williams@intel.com>
Thu, 12 Nov 2015 00:27:38 +0000 (16:27 -0800)
committerTejun Heo <tj@kernel.org>
Mon, 16 Nov 2015 16:29:10 +0000 (11:29 -0500)
commit4c90ba5d1bf8bc2771dba7da7a0716b2680c8b1b
tree02bd0d5a1aa33e2fa3cb509ca4607b9ff11558bctree | snapshot
parent04985571dd8f94e965c3ef1d400bc9271b303ac8commit | diff
ahci: switch from 'threaded' to 'hardirq' interrupt handling

For high frequency I/O the overhead of threaded interrupts impacts
performance.  A quick out-of-the-box test (i.e. no affinity tuning)
shows ~10% random read performance at ~20% less cpu.  The cpu wins
appear to be from reduced lock contention.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
drivers/ata/libahci.c diff | blob | history
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