Date: Sat, 17 Jun 2006 18:24:36 -0300 (ADT) From: "Marc G. Fournier" <scrappy@hub.org> To: Dan Nelson <dnelson@allantgroup.com> Cc: freebsd-stable@freebsd.org Subject: Re: 6.1: kern.ipc.maxpipekva Message-ID: <20060617182336.O1114@ganymede.hub.org> In-Reply-To: <20060617200755.GG74191@dan.emsphone.com> References: <20060617164334.K1114@ganymede.hub.org> <20060617165626.V1114@ganymede.hub.org> <20060617200755.GG74191@dan.emsphone.com>
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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@hub.org MSN . scrappy@hub.org
Yahoo . yscrappy Skype: hub.org ICQ . 7615664
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