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authorMark Lord <liml@rtr.ca>2009-03-11 05:01:17 +0300
committerJeff Garzik <jgarzik@redhat.com>2009-03-25 05:35:37 +0300
commit2b748a0a344847fe6b924407bbe153e1878c9f09 (patch)
tree0a84cdbc70d0b9a7e974299bbaa0cba4b9610a58 /drivers/xen
parent40f21b1124a9552bc093469280eb8239dc5f73d7 (diff)
downloadlinux-2b748a0a344847fe6b924407bbe153e1878c9f09.tar.xz
sata_mv: implement IRQ coalescing (v2)
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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