Date: Sat, 17 Jun 2006 21:31:48 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: "Marc G. Fournier" <scrappy@hub.org> Cc: freebsd-stable@freebsd.org Subject: Re: 6.1: kern.ipc.maxpipekva Message-ID: <20060618023148.GJ74191@dan.emsphone.com> In-Reply-To: <20060617182336.O1114@ganymede.hub.org> References: <20060617164334.K1114@ganymede.hub.org> <20060617165626.V1114@ganymede.hub.org> <20060617200755.GG74191@dan.emsphone.com> <20060617182336.O1114@ganymede.hub.org>
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In the last episode (Jun 17), Marc G. Fournier said: > 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 "fstat | grep pipe" will tell you what processes have them open on what fds. pipes on fds 0, 1 and 2 are probably from shell pipelines. -- Dan Nelson dnelson@allantgroup.com
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