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

Manfred Spraul
2008-06-24T18:00:50Z

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