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Re: FIXED: mpt Serious performance issues
On Wed, Feb 09, 2011 at 09:38:02AM -0700, Michael L. Hitch wrote:
> This might be the "adapt->adapt_max_periph = maxq" setting in
> mpt_netbsd.c, if maxq is > 256. The tagging done in the scsipi
> layer can only deal with 256 tags. I'm not sure how that would
> affect the mpt(4) driver. I did some work to get ciss(4) to do
> tagged queueing, and as best I could understand tagged queuing and
But ciss uses ld(4), doesn't it? It's not a SCSI adapter?
There should be no harm to supporting less tags than the maximum for
FibreChannel -- we just won't use all the potential queueing resources
of the device. If there's an issue with FC or SAS targets I suspect it
is something different.
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