tree 4bee48a706dec1da02e927309b6851f57730337c
parent d09816ae8fc05322b4e37a589537b4ecdca28a0d
author Martin Svec <martin.svec@zoner.cz> 1358282615 -0800
committer Nicholas Bellinger <nab@linux-iscsi.org> 1360783651 -0800

target/rd: improve sg_table lookup scalability

Sequential scan of rd_dev->sg_table_array in rd_get_sg_table is
a serious I/O performance bottleneck for large rd LUNs. Fix this
by computing the sg_table index directly from page offset because
all sg_tables (except the last one) have the same number of pages.

Tested with 90 GiB rd_mcp LUN, where the patch improved maximal
random R/W IOPS by more than 100-150%, depending on actual
hardware and SAN setup.

Signed-off-by: Martin Svec<martin.svec@zoner.cz>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>