On 08/20/13 19:04, Nicholas A. Bellinger wrote:
On Tue, 2013-08-20 at 18:15 +0200, Bart Van Assche wrote:
On 08/20/13 18:11, Nicholas A. Bellinger wrote:
On Tue, 2013-08-20 at 14:05 +0200, Bart Van Assche wrote:
This patch series consists of four patches that address device removal
issues and three patches that improve performance of the SCSI mid-layer.
Perhaps it would be useful to know what the performance improvement
actually is..? Eg: fio numbers before and after.
The optimizations in this patch series are micro-optimizations. Their
performance impact is small but measurable. Peak IOPS results are
improved by about 1% by each of these performance improvements for a
low-latency transport.
So that is 250K to 252.5K per LUN, or what..?
The exact numbers depend on the number of CPU's in the initiator system,
the number of CPU's in the target system, the transport type, HCA model,
SCSI target stack configuration, target storage medium etc. If you want
to verify yourself the impact of this patch without all these
dependencies, that's possible by running a test against the scsi_debug
driver.
Bart.
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