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

[Manfred Spraul <manfred@colorfullife.com>]

Solofo.Ramangalahy@bull.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