From: David Dillow Date: Wed, 19 Dec 2007 22:09:15 +0000 (-0500) Subject: IB/srp: Enable SG list chaining X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=fff09a8e6e726f0752254e1f46f7224e3bebb302;p=deliverable%2Flinux.git IB/srp: Enable SG list chaining By default, the SCSI mid-layer seems to send down 512KB requests (sg_tablesize = 256), with some requests occasionally combined. By allowing the mid-layer to chain requests, we can easily grow to 1024KB or larger -- I've tested 4096KB I/O requests with no problems. I looked through the DMA paths on the hardware drivers to ensure they could take advantage of the SG chaining, and it seems that every one except ipath uses the system's DMA routines, which have been converted to handle chaining. ipath looks like it should be OK, but I have no way to test it. Signed-off-by: David Dillow [ Tested on ipath. - Roland ] Signed-off-by: Roland Dreier --- diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index e98d0612d7ac..66dade7ab38b 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -1548,6 +1548,7 @@ static struct scsi_host_template srp_template = { .this_id = -1, .cmd_per_lun = SRP_SQ_SIZE, .use_clustering = ENABLE_CLUSTERING, + .use_sg_chaining = ENABLE_SG_CHAINING, .shost_attrs = srp_host_attrs };