Date: Wed, 11 Jan 2012 01:35:44 +0200 From: Alexander Motin <mav@FreeBSD.org> To: lev@FreeBSD.org Cc: FreeBSD current <freebsd-current@freebsd.org>, net@freebsd.org Subject: Re: Very fresh (two days ago) 10-current becomes completely unresponsive under load Message-ID: <4F0CCB50.8020109@FreeBSD.org> In-Reply-To: <108354307.20120111032108@serebryakov.spb.ru> References: <1791250845.20120111030529@serebryakov.spb.ru> <108354307.20120111032108@serebryakov.spb.ru>
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On 01/11/12 01:21, Lev Serebryakov wrote: > Hello, Lev. > You wrote 11 января 2012 г., 3:05:29: > >> OH! I have top running right now, when it "hangs". 0% idle time, LA >> becomes 20 when it have only 35 processes at all, but there is no specific >> process consuming CPU. > Ok, it seems, that here is a problem (CPU time : > > PID USERNAME PRI NICE SIZE RES STATE TIME WCPU COMMAND > 12 root -16 - 0K 8K sleep 18:35 30.18% ng_queue > > And after that 5 minutes without updates, than normal numbers. It > seems, that root of problem is: > > (a) netgraph in this version of kernel > OR > (b) new mpd 5.6 (previous version had 5.5). I remember no changes in mpd-5.6 that I would expect to cause this. Any way it should be trivial to check -- just build 5.5. What do you have configured in mpd configuration and netgraph at all? AFAIR for plain PPPoE it is not very typical to use ng_queue at all as it doesn't requires stack unwrapping and at least few years ago stack size was sufficient to run all processing in one pass. -- Alexander Motin
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