Date: Tue, 18 Jan 2011 12:20:11 -0500 From: Mike Tancsa <mike@sentex.net> To: Eugene Grosbein <egrosbein@rdtc.ru> Cc: freebsd-net@freebsd.org Subject: Re: Netgraph/mpd5 stability issues Message-ID: <4D35CBCB.1040001@sentex.net> In-Reply-To: <4D346AEB.8000807@rdtc.ru> References: <4D3011DB.9050900@frasunek.com> <4D30458D.30007@sentex.net> <4D341E80.7000303@rdtc.ru> <4D342AEC.4030600@sentex.net> <4D346AEB.8000807@rdtc.ru>
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On 1/17/2011 11:14 AM, Eugene Grosbein wrote: > On 17.01.2011 17:41, Mike Tancsa wrote: > >>>> I also have stability issues on RELENG_8. >>>> >>>> http://www.freebsd.org/cgi/query-pr.cgi?pr=153497 >>> >>> Do you change net.isr.direct from default 1 to 0 for your box? >> >> No, I leave it at 1 >> >> ---Mike > > I was experiencing some instability with mpd/netgraph too > but found workaround: increase netgraph buffers/queues. > > For 4GB RAM, /boot/loader.conf: > > # netgraph queue sizes tuning, see vmstat -z|egrep 'ITEM|NetGraph' > net.graph.maxdata=65536 > net.graph.maxalloc=65536 > > For /etc/sysctl.conf: > > kern.ipc.maxsockbuf=83886080 > net.graph.maxdgram=8388608 > net.graph.recvspace=8388608 > > It helps not to overflow netgraph event queues in my case > and takes away netgraph-related stability problems. I have only 2G of RAM on i386. On a box that has ipv6 disabled, with 641 ng interfaces right now # vmstat -z | egrep -i 'item|netg' ITEM SIZE LIMIT USED FREE REQUESTS FAILURES NetGraph items: 36, 4130, 2, 234, 8855752088, 0 NetGraph data items: 36, 531, 0, 472, 20152691765, 0 This is with 21 days of uptime and its quite stable. Enabling ipv6 seems to make the problems more likely for me. I had to restart it as the values I chose were too high and I was getting negative sbsize for uid = 0 vmstat -z | egrep -i 'ITEM|Netg' ITEM SIZE LIMIT USED FREE REQUESTS FAILURES NetGraph items: 36, 8201, 0, 236, 25397, 0 NetGraph data items: 36, 2065, 0, 236, 54671, 0 I tweaked things down net.graph.maxdata=2048 net.graph.maxalloc=8192 net.inet.ip.intr_queue_maxlen=500 kern.ipc.maxsockbuf=1048576 net.graph.maxdgram=524288 net.graph.recvspace=524288 I also have devd_enable="NO" ---Mike
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