Mark Lord wrote:
Guys,
I have added IRQ coalescing to sata_mv, but need a way to activate/tune it.
There are two simple parameters: an IRQ count threshold, and a time
threshold.
Whenever either the count or the time threshold is exceeded,
the chip will generate an interrupt (assuming at least one completed
event).
These two parameters are per-chip (actually, per group of four ports
within the chip).
How can I export these for setting/query withing sysfs ?
It is all rather easy to create per-SCSI-host attrs in sysfs,
but I don't see any obvious way to do it per-chip.
Suggestions?
The absence of a kobject associated with ata_host is largely the root
cause of this problem you've noted. Long term, we want to move in a
direction where we have a "storage_host" container object, containing
one or more port-style objects that can be ATA or SCSI. In that
scenario (and what we want to move towards, over the years), the sysfs
attachment points should be fairly obvious.
Lacking a better suggestion, I suppose the answer is exporting per-chip
variables multiple times, once per scsi-host. Just get the locking
right, since multiple sysfs attributes access the same underlying
per-chip variable.
For now, I'm doing it with a module parameter,
but that's really rather stone-age in the sysfs era.
Indeed! :)
Jeff
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