6.1: kern.ipc.maxpipekva

[Marc G. Fournier]

On Sat, 17 Jun 2006, Dan Nelson wrote:

> In the last episode (Jun 17), Marc G. Fournier said:
>> On Sat, 17 Jun 2006, Marc G. Fournier wrote:
>>> Jun 17 16:00:03 pluto kernel: kern.ipc.maxpipekva exceeded; see tuning(7)
>>> Jun 17 16:00:04 pluto kernel: kern.ipc.maxpipekva exceeded; see tuning(7)
>>>
>>> but I can't seem to find anything in tuning(7) about it ... so, what
>>> is it and how do I monitor for it?
>>
>> More on this:
>>
>> # sysctl -a | grep pipekva
>> kern.ipc.maxpipekva: 16777216
>> kern.ipc.pipekva: 15122432
>>
>> and I just rebooted the server ...
>>
>> so obviously I've been living on the edge ... not sure what to increase it
>> to, since not sure what it affects, so will wait on responses ...
>
> Try also running "sysctl kern.ipc | grep pipe", which will also tell
> you how many pipes are in use, plus some other counters.  The comment
> at the top of sys/kern/sys_pipe.c explains how pipes are given memory.

What uses all of these pipes?  right now, with 97 jails running:

kern.ipc.maxpipekva: 25165824
kern.ipc.pipes: 7038
kern.ipc.pipekva: 22179840
kern.ipc.pipefragretry: 0
kern.ipc.pipeallocfail: 0
kern.ipc.piperesizefail: 0
kern.ipc.piperesizeallowed: 1

That is an average of 7 pipes per process:

pluto# ps aux | wc -l
     1326


----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email . scrappy at hub.org                              MSN . scrappy at hub.org
Yahoo . yscrappy               Skype: hub.org        ICQ . 7615664