Date: Tue, 27 Jan 2004 17:37:05 +0100 From: des@des.no (Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=) To: Mike Silbersack <silby@silby.com> Cc: current@freebsd.org Subject: Re: 'kern.maxpipekva exceeded' messages... Message-ID: <xzpr7xl8i1a.fsf@dwp.des.no> In-Reply-To: <20040127101910.P4636@odysseus.silby.com> (Mike Silbersack's message of "Tue, 27 Jan 2004 10:24:44 -0600 (CST)") References: <20040119233546.S39477@odysseus.silby.com> <xzpznc9tzgz.fsf@dwp.des.no> <20040127101910.P4636@odysseus.silby.com>
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Mike Silbersack <silby@silby.com> writes: > I do not believe that there is a leak. What actually happened is > that between 5.1 and 5.2 I added pipe memory limits, which had not > been present before. Oh! I wasn't aware that the limit did not already exist. > 1. Pipes overallocate memory greatly; I could probably reduce the > memory usage of an idle pipe by 8x or so. My problem is not idle pipes; my problem is that the following system # sysctl kern.ipc.maxpipekva kern.ipc.maxpipekva: 8704000 # sysctl kern.ipc.pipekva kern.ipc.pipekva: 393216 runs out of pipe kva every monday morning when it tries to pipe a level 0 dump through ssh. Is there some way to impose a limit on the memory consumed by a single pipe? I don't care if dump blocks waiting for ssh to push out the data, but I do care about the system crashing shortly after running out of pipe kva. Another problem I have is with a system that runs out of pipe kva when I create a large number of jails. I really need a way to find out where all that memory goes... > If you're interested in working on this right now, I can send you what I > had planned to do for #1, it would be a very small amount of code, > although it would require a bit of testing to ensure that it does not > degrade the performance of pipes by a noticeable amount. That would be nice. I have several systems I can test it on. DES --=20 Dag-Erling Sm=F8rgrav - des@des.no
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