Date: Fri, 02 Aug 2013 08:35:07 -0400 From: Mike Tancsa <mike@sentex.net> To: Andre Oppermann <andre@freebsd.org> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: Listen queue overflow Message-ID: <51FBA77B.7010307@sentex.net> In-Reply-To: <51FACE73.90707@freebsd.org> References: <51FA750C.50502@sentex.net> <51FACE73.90707@freebsd.org>
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On 8/1/2013 5:09 PM, Andre Oppermann wrote: > On 01.08.2013 16:47, Mike Tancsa wrote: >> After upgrading from a RELENG9 kernel from June 18th to July 27th, I am >> seeing this odd new message. Is this a new bug, or just a new >> diagnostic message ? I am guessing it happened after r253035 ? >> >> >> sonewconn: pcb 0xfffffe001ac76930: Listen queue overflow: 8 already in >> queue awaiting acceptance > > This message tells you that your daemon listening on that protocol control > block isn't keeping up with accepting new messages and each time one of > these > lines appears the kernel had to reject a connection attempt (RST) > because of > too many connections already waiting in the listen queue. > > The only unusual thing here is the low listen queue size of only 8 > connection > attempts. The default kernel value is about 20 times as many. Have you or > your application changed it manually? > Not knowingly. The odd thing is that happened at exactly 9am 2 days in a row. I dont schedule anything on the box for that time Jul 29 09:00:00 backup3 kernel: sonewconn: pcb 0xfffffe001ac76930: Listen queue overflow: 8 already in queue awaiting acceptance Jul 29 09:00:00 backup3 last message repeated 3 times Jul 30 09:00:00 backup3 kernel: sonewconn: pcb 0xfffffe001ac76930: Listen queue overflow: 8 already in queue awaiting acceptance Jul 30 09:00:00 backup3 last message repeated 5 times Seems a bit coincidental. Box is AMD64 9.2-BETA2 FreeBSD 9.2-BETA2 #0 r253707: Its a backup server. It does outbound rsync, but that wasnt running at the times of the errors. No unusual inbound traffic at those times. Its also running radium, to connect to a number of argus sensors, but those are outbound connections. /etc/sysctl.conf net.inet.tcp.recvbuf_max=16777216 net.inet.tcp.recvspace=131072 net.inet.tcp.sendbuf_max=16777216 net.inet.tcp.sendspace=32768 net.inet.udp.recvspace=65536 kern.ipc.somaxconn=1024 net.inet.ip.redirect=0 net.inet.ip.intr_queue_maxlen=4096 net.route.netisr_maxqlen=1024 kern.ipc.nmbclusters=262144 vfs.ufs.dirhash_maxmem=8097152 vfs.read_min=2 As well as nfs, it also runs samba for windows backups. ---Mike -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/
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