On Wed, 2005-03-16 at 18:53 +0000, Matthew Wilcox wrote: > On Wed, Mar 16, 2005 at 10:44:50AM -0800, Mike Christie wrote: > > I got lost here. If you are talking about the need to kmap a sglist then > > software iscsi has it. iscsi-sfnet used to do > > > > while (...) > > kmap() > > > > but I fixed that (I think I need to use kmap_atomic though, is that > > correct or is it just a performance improvement - I am calling kmap from > > a thread too so). I just added kmap_atomic to open-iscsi and I believe > > pyx does something similar to the loop above. > > Sounds like networking should grow an interface to accept a sglist as > input. I'm really not familiar with Linux's networking stack to know > how to do it ... cc'ing netdev to get their thoughts.
This is a nice idea, but will not always work with iSCSI protocol simply because iSCSI PDU's data sizes might be negotiated to be lesser/bigger than original WRITE's sglist size. It might help to optimize some data path when PDU's data segment size >= sglist size. i.e. entire sglist needs to be passed down to the stack. i'm cross-posting to open-iscsi mailing list, so open-iscsi folks might participate in the discussion. Dmitry - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
