sata_mv: implement IRQ coalescing (v2)

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Add IRQ coalescing to sata_mv (off by default).

This feature can reduce total interrupt overhead for RAID setups
in some situations, by deferring the interrupt signal until one or both of:

 a) a specified io_count (completed SATA commands) is achieved, or
 b) a specified time interval elapses after an IO completion.

For now, module parameters are used to set the irq_coalescing_io_count
and irq_coalescing_usecs (timeout) globally.  These may eventually
be supplemented with sysfs attributes, so that thresholds can be set
on-the-fly and on a per-chip (or even per-host_controller) basis.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

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Mark Lord 2009-03-10 22:01:17 -04:00 • committed by Jeff Garzik

parent 40f21b1124

commit 2b748a0a34

1 changed files with 135 additions and 8 deletions

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drivers/ata/sata_mv.c

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