Date: Fri, 11 Sep 2009 21:28:15 +0200 From: Pieter de Goeje <pieter@degoeje.nl> To: freebsd-current@freebsd.org, pyunyh@gmail.com Subject: Re: BETA3: network processes hang in keglimit (unkillable) Message-ID: <200909112128.15645.pieter@degoeje.nl> In-Reply-To: <20090911173756.GA1100@michelle.cdnetworks.com> References: <200909111924.10927.pieter@degoeje.nl> <20090911173756.GA1100@michelle.cdnetworks.com>
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On Friday 11 September 2009, Pyun YongHyeon wrote: > On Fri, Sep 11, 2009 at 07:24:10PM +0200, Pieter de Goeje wrote: > > I just experienced a complete loss of network, where every network > > related process would sleep on "keglimit". I was unable to recover from > > this situation. I tried killing the processes with SIGKILL, but it didn't > > work, and I tried to bring the network interface (em) down and up again, > > which also didn't work. A reboot "solved" the problem. The machine was > > handling some major traffic, both TCP and UDP. > > > > Apparently the system was waiting on some resource to free up, but what > > could it be? How can this situation be avoided in the future? > > > > uname: 8.0-BETA3 FreeBSD 8.0-BETA3 #1: Sun Aug 30 01:23:36 CEST 2009 > > amd64 > > Both em(4) and igb(4) had mbuf leak bug which was recently fixed by > Jack. Check mbuf statistics with "netstat -m" and see whether > you've reached mbuf resource limit(see 4K jumbo cluster counter). > The leak can be easily seen on UDP traffic, especially NFS over UDP. Ok, that matches my usage (NFS over UDP), so I will monitor mbuf usage and test Jack's fixes when they're MFCed (or sooner if I can reproduce this). Thank you for your reply, Pieter de Goeje
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