Re: SysV IPC msg queue limits

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Tani Hosokawa wrote:
>
> I'm trying to increase the limits for SysV message queues (specifically,
> MSGMNB, MSGMNI, and MSGQNUM). I can increase the first two with no problem.
>
> When I try to increase MSGMNB, it fails.

You cannot increase MSGMNB > 65535.

> I can't even write a single
> message without getting EAGAIN. I assume this is because of the msqid_ds
> structure:

Do you set it to a multiple of 64k? Then the kernel treats this value as
zero.

> Has anyone else attempted to increase MSGMNB to, say, 256k?
>

The current development kernel supports messages and message queues up
to INT_MAX, but you might run out of memory if you use such messages ;)

--
	Manfred
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