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scst_lib: Improve WRITE SAME performance

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Some storage devices have a block size of 512 bytes and a minimum
I/O size and/or optimal I/O size of 4096 bytes. Improve WRITE SAME
performance for such devices by increasing the I/O granularity from
512 bytes to 4096 bytes.

Based on a patch written by Vishal Tripathi <vishal.tripathi@calsoftinc.com>
and Sushil Sharma <sushil.sharma@calsoftinc.com>.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>

+ with some minor changes



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@6189 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2015-05-01 02:04:39 +00:00
parent 1e78126962
commit 0b4fe40d3e
2 changed files with 116 additions and 11 deletions
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scst/include/scst.h
+4
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@@ -4080,6 +4080,10 @@ static inline void *sg_virt(struct scatterlist *sg)
return page_address(sg_page(sg)) + sg->offset;
}
static inline void sg_mark_end(struct scatterlist *sg)
{
}
#ifndef __BACKPORT_LINUX_SCATTERLIST_H_TO_2_6_23__
static inline void sg_init_table(struct scatterlist *sgl, unsigned int nents)