linux-kernel - Re: [RFC -mm 0/6] sysv ipc: scale msgmnb with the number of cpus

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Message-ID: <18507.34830.260384.473257@frecb006361.adech.frec.bull.fr>
Date:	Sun, 8 Jun 2008 09:19:42 +0200
From:	Solofo.Ramangalahy@...l.net
To:	Manfred Spraul <manfred@...orfullife.com>
Cc:	Solofo.Ramangalahy@...l.net, linux-kernel@...r.kernel.org,
	Matt Helsley <matthltc@...ibm.com>,
	Mingming Cao <cmm@...ibm.com>,
	Nadia Derbey <Nadia.Derbey@...l.net>,
	Yasunori Goto <y-goto@...fujitsu.com>
Subject: Re: [RFC -mm 0/6] sysv ipc: scale msgmnb with the number of cpus

Manfred Spraul writes:
 > > The size in bytes of a SysV IPC message queue, msgmnb, is too small
 > > for large machines, but we don't want to bloat small machines
 > >
 > > Several methods are used already to modify (mainly increase) msgmnb:
 > > . distribution specific patch
 > > . system wide sysctl.conf
 > > . application specific tuning via /proc/sys/kernel/msgmnb
 > >
 > >   
 > Which distributions use a patch?

opensuse has this:

"The defaults are too small for most users."

[...]
 #define MSGMNI    16   /* <= IPCMNI */     /* max # of msg queue identifiers */
-#define MSGMAX  8192   /* <= INT_MAX */   /* max size of message (bytes) */
-#define MSGMNB 16384   /* <= INT_MAX */   /* default max size of a message queue */
+#define MSGMAX  65536   /* <= INT_MAX */   /* max size of message (bytes) */
+#define MSGMNB 65536   /* <= INT_MAX */   /* default max size of a message queue */
[...]

-- 
solofo

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