On Fri, 6 Mar 2009 09:55:29 +0100 Jens Axboe <jens.axboe@xxxxxxxxxx> wrote: > > If it's settable at init time, that would probably be enough for > > the vast majority of uses (and more flexible than what we have now) > > and a lot easier to implement. > > Completely agree, don't waste time implementing something that nobody > will ever touch. The only reason to fiddle with such a setting would be > to increase it, because ios are too small. And even finding out that the > segment limit is the one killing you would take some insight and work > from the user. > > Just make it Big Enough to cover most cases. 32 is definitely small, 256 > entries would get you 1MB ios which I guess is more appropriate. I guess that the dynamic scheme is overdoing but seems that vendors like some way to configure the sg entry size. The new MPT2SAS driver has SCSI_MPT2SAS_MAX_SGE kernel config option: http://marc.info/?l=linux-scsi&m=123619290803547&w=2 The kernel module option for this might be appropriate. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
