On 05/05/15 23:06, Christoph Hellwig wrote:
The contiguous requirements isn't something we can alway guarantee. While a lot of I/O will have that form the form where there are holes can happen, although it's not common.
Indeed. That is why there is code in the SRP initiator that uses multiple FRWR registrations when a discontiguous SG-list is passed to that driver by the SCSI mid-layer. Some time ago I had posted a test program that makes the SCSI mid-layer submit a discontiguous I/O request to a SCSI LLD (see also https://www.mail-archive.com/linux-rdma@xxxxxxxxxxxxxxx/msg21224.html).
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