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authorNicholas Bellinger <nab@linux-iscsi.org>2013-05-11 16:16:49 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2013-05-11 16:22:39 -0700
commit52c07423a819091b0fe9abbf26977098b996f85b (patch)
treef67881445756abfe47ba8c59210419deff447d8e /drivers/target/iscsi
parent3eccfdb01da58fbd0f789ae6ca61cee3769e26de (diff)
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op-kernel-dev-52c07423a819091b0fe9abbf26977098b996f85b.tar.gz
target/rd: Add ramdisk bit for NULLIO operation
This patch adds a rd_nullio parameter that allows RAMDISK_MCP backends to function in NULLIO mode, where all se_cmd I/O is immediately completed in rd_execute_rw() without actually performing the SGL memory copy. This is useful for performance testing when the ramdisk SGL memory copy begins to eat lots of cycles during heavy small block workloads, so allow this bit to be enabled when necessary on a per rd_dev basis. Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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