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ib_srpt README: Document cmd_sg_entries

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4750 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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Bart Van Assche
2013-01-31 14:05:25 +00:00
parent bdca4a2011
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@@ -343,6 +343,13 @@ Performance Notes - Target Side
Performance Notes - Initiator Side
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* Choose a proper value for the ib_srp kernel module parameter
cmd_sg_entries. The default value 12 works well for buffered reads while
the throughput for write-dominated workloads improves by changing this value
into 255. One way to set this kernel module parameter is as follows:
echo options ib_srp cmd_sg_entries=255 >>/etc/modprobe.d/ib_srp.conf
* For multithreaded workloads using small block sizes changing rq_affinity
into 2 improves IOPS significantly (Linux kernel 3.1 and later; see also
commit 5757a6d76cdf6dda2a492c09b985c015e86779b1).