On Wed, 08 Aug 2007 11:58:14 -0500 Mike Christie <michaelc@xxxxxxxxxxx> wrote: > FUJITA Tomonori wrote: > > On Tue, 07 Aug 2007 12:13:41 -0500 > > Mike Christie <michaelc@xxxxxxxxxxx> wrote: > > > >> FUJITA Tomonori wrote: > >>> Allocating 64K contiguous memory is not good so the next thing to do > >>> is converting sg to use the sg chaining support fully. Or it might be > >> For LLDs like aic7xxx, I think we are stuck with a small > >> scsi_host_template->sg_tablesize, so to continue to get large requests > >> like before will we have to still allocate large segments? > > > > No. sg.c has: > > > > sizeof(struct scatterlist) * min(q->max_hw_segments, q->max_phys_segments) > > > > If a lld has small max_hw_segments, it doesn't allocate big contiguous > > memory. > > > > Are we talking about the same thing? Are you saying that it does not > allocate big continuous memory for the scatterlist right? I was asking > about continuous memory for the buffer sg.c copies data to/from for the > IO operation. I was saying that currently for something like aic if we > want to continue to support 8 MB commands (or whatever it was) like > before, then because its sg_tablesize/max_hw_segments is so small we > have to continue allocating large IO buffers. That did not change right? > If so let me know because you save me :) Oops, sorry. I think that nothing changes about large IO buffers. You have to contiunue to allocate large IO buffers like before. - 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
