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From: Malahal Naineni <malahal@us.ibm.com>
To: dm-devel@redhat.com
Subject: [PATCH] [RFC] multipath: change the DEFAULT_MINIO for the request based multipath
Date: Wed, 19 Jan 2011 13:30:07 -0800	[thread overview]
Message-ID: <91d6dae7d88296d8a1fe.1295472607@malahal> (raw)

The value of 1000 is good for bio based multipath. Seen 50% increase in
I/O ops by setting it to 1 in request based multipath configuration.
This patch would give poor performance for people still using the bio
based multipath!

Is it possible to detect request based multipath and change only for
those configurations?

diff -r e504a50b0db5 -r 91d6dae7d882 libmultipath/defaults.h
--- a/libmultipath/defaults.h	Wed Jan 19 13:16:40 2011 -0800
+++ b/libmultipath/defaults.h	Wed Jan 19 13:29:52 2011 -0800
@@ -5,7 +5,7 @@
 #define DEFAULT_ALIAS_PREFIX	"mpath"
 #define DEFAULT_FEATURES	"0"
 #define DEFAULT_HWHANDLER	"0"
-#define DEFAULT_MINIO		1000
+#define DEFAULT_MINIO		1
 #define DEFAULT_PGPOLICY       FAILOVER
 #define DEFAULT_FAILBACK       -FAILBACK_MANUAL
 #define DEFAULT_RR_WEIGHT      RR_WEIGHT_NONE

             reply	other threads:[~2011-01-19 21:30 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-19 21:30 Malahal Naineni [this message]
2011-01-20  7:32 ` [PATCH] [RFC] multipath: change the DEFAULT_MINIO for the request based multipath Hannes Reinecke
2011-01-20 16:07   ` Mike Snitzer
2011-01-21  7:03     ` Jun'ichi Nomura
2011-01-21  8:47       ` Christophe Varoqui
2011-01-21 14:12         ` Mike Snitzer
2011-01-21 14:46           ` Christophe Varoqui
2011-01-21 17:39             ` Malahal Naineni
2011-01-25  8:56               ` Jun'ichi Nomura
2011-01-26  2:23                 ` Malahal Naineni
2011-01-26 17:27                   ` nishant mungse
2011-01-27 15:16                     ` nishant mungse
2011-01-31 23:53                   ` Christophe Varoqui
2011-02-01  2:21                     ` Malahal Naineni
2011-02-01  3:13                       ` Mike Snitzer
2011-02-01  8:14                         ` Malahal Naineni
2011-02-01  8:13                     ` Malahal Naineni
2011-02-01  9:00                       ` Christophe Varoqui
2011-02-01  9:51                         ` Malahal Naineni
2011-01-21 13:26       ` Mike Snitzer

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