Hello,
ipcs (msg) gives incorrect results if used-bytes is above 65536. It
stays at 65536 even though messages are being read and removed from the
msg queue.
The sysv msg queue either ignores the /proc/sys/kernel/msgmnb value if
it is above 65536 or simply gets it wrong. Proof: I can place more than
msgmnb bytes in a queue. The behavior is not consistent, but 100%
reproducable. It's not consistent because if I use messages of about
1000-2000 bytes the msgmnb never gets bigger than 65536 (even if
/proc/sys/kernel/msgmnb is set to 1048576 - bug). However, if I use
small messages like 13 bytes I can get bizarre (wrong) ipcs results
like this:
used-bytes messages
65536 65536
Why does Linux ignore the /proc/sys/kernel/msgmnb value - or seem to
partly ignore it if it is above 65536? I *really* need this to be
around a MB. Is there an undocumented limit here or is this a bug?
Thanks.
=====
A camel is ugly but useful; it may stink, and it may spit, but it'll get you where you're going. - Larry Wall -
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This archive was generated by hypermail 2b29 : Sat Feb 17 2001 - 13:45:57 EST