Date: Thu, 3 Nov 2011 14:05:07 +0000 From: "Li, Qing" <qing.li@bluecoat.com> To: "Alexander V. Chernikov" <melifaro@FreeBSD.org>, Steven Hartland <killing@multiplay.co.uk> Cc: "qingli@freebsd.org" <qingli@FreeBSD.org>, "liv3d@multiplay.co.uk" <liv3d@multiplay.co.uk>, "freebsd-stable@FreeBSD.org" <freebsd-stable@FreeBSD.org> Subject: RE: serious packet routing issue causing ntpd high load? Message-ID: <B143A8975061C446AD5E29742C531723174F0D@PWSVL-EXCMBX-01.internal.cacheflow.com> In-Reply-To: <4EB29A84.6070104@FreeBSD.org> References: <2740DA0E7C0F495BA00E6D4BC0FE8F37@multiplay.co.uk> <B143A8975061C446AD5E29742C53172313BC17@PWSVL-EXCMBX-01.internal.cacheflow.com> <040F9FF759DA441392432EDBD5C4D2CF@multiplay.co.uk>, <4EB29A84.6070104@FreeBSD.org>
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This endless route lookup miss message problem is reproducible without FLOWTABLE. The problem is with the multiple FIBs. I cannot reproduce this problem in my home network but the problem is easily seen at work. The route lookup miss itself in multi-FIBs configuration may be normal depending on the actual system configuration. It's the flooding of RTM_MISS messages that is abnormal. For example, if the route to the DNS servers is not configured in all FIBs, then the RTM_MISS message will be generated when an userland application sends to an explicit IP address in a specific FIB. In any case, I can reproduce the issue consistently and just trying to get a few uninterrupted hours to get it done. --Qing ________________________________________ From: Alexander V. Chernikov [melifaro@FreeBSD.org] Sent: Thursday, November 03, 2011 6:43 AM To: Steven Hartland Cc: Li, Qing; freebsd-stable@FreeBSD.org; liv3d@multiplay.co.uk Subject: Re: serious packet routing issue causing ntpd high load? -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 10.10.2011 13:50, Steven Hartland wrote: > ----- Original Message ----- From: "Li, Qing" <qing.li@bluecoat.com> > >>> RTM_MISS: Lookup failed on this address: len 184, pid: 0, seq 0, errno >>> 0, flags:<DONE> >>> locks: inits: >>> sockaddrs: <DST> >>> ::A.B.C.D >>> I'm unable to reproduce an issue on (nearly) GENERIC 8-S, but I see nearly the same situation on 8.1-S box with FLOWTABLE enabled. Do you have FLOWTABLE option in your kernel config ? >> >> Would it be possible for you to email me what exactly does "::A.B.C.D" >> map into WRT your system or infrastructure ? > > Sorry for the slow reply been out of the country. > > All the hosts are local machines same /24 connecting to the server for > mysql. It seems to be that every packet either to or from for the mysql > server is generating an RTM_MISS. > >> And are you able to share your "ifconfig -a" and "netstat -rn" output >> with me privately ? > > On its way. > > Regards > Steve > > ================================================ > This e.mail is private and confidential between Multiplay (UK) Ltd. and > the person or entity to whom it is addressed. In the event of > misdirection, the recipient is prohibited from using, copying, printing > or otherwise disseminating it or any information contained in it. > In the event of misdirection, illegible or incomplete transmission > please telephone +44 845 868 1337 > or return the E.mail to postmaster@multiplay.co.uk. > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" > - -- WBR, Alexander -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk6ymoMACgkQwcJ4iSZ1q2meiACeKq4lhzw6scqCKzEyTNEeycxo 31QAn2q5KIRBwJpcF7yOpTe3wOcP3Aak =jfKN -----END PGP SIGNATURE-----
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