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

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Date:	Tue, 24 Jun 2008 20:00:21 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Solofo.Ramangalahy@...l.net
CC:	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

Solofo.Ramangalahy@...l.net wrote:
> Humm... now this make me think that you did not change the MSGMNB
> value when you changed MSGMNI and MSGMAX.
> Maybe that was on purpose?
>
>   
I was afraid that it might break user space applications that queue a 
few kb of messages.
That's also the reason for
>                 if (msgsz + msq->q_cbytes <= msq->q_qbytes &&
>                                 1 + msq->q_qnum <= msq->q_qbytes) {
>                         break;
>                 }
It's possible to send 0-byte messages even if the  message queue is full 
[except that you can't send more than MSGMNB messages].

--
    Manfred
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