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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 FLOW=
TABLE. =0A=
The problem is with the multiple FIBs. I cannot reproduce this problem in m=
y home network =0A=
but the problem is easily seen at work.=0A=
=0A=
The route lookup miss itself in multi-FIBs configuration may be normal depe=
nding on =0A=
the actual system configuration. It's the flooding of RTM_MISS messages tha=
t is abnormal.=0A=
For example, if the route to the DNS servers is not configured in all FIBs,=
 then the RTM_MISS =0A=
message will be generated when an userland application sends to an explicit=
 IP address=0A=
in a specific FIB.=0A=
=0A=
In any case, I can reproduce the issue consistently and just trying to get =
a few uninterrupted =0A=
hours to get it done.=0A=
=0A=
--Qing=0A=
=0A=
________________________________________=0A=
From: Alexander V. Chernikov [melifaro@FreeBSD.org]=0A=
Sent: Thursday, November 03, 2011 6:43 AM=0A=
To: Steven Hartland=0A=
Cc: Li, Qing; freebsd-stable@FreeBSD.org; liv3d@multiplay.co.uk=0A=
Subject: Re: serious packet routing issue causing ntpd high load?=0A=
=0A=
-----BEGIN PGP SIGNED MESSAGE-----=0A=
Hash: SHA1=0A=
=0A=
On 10.10.2011 13:50, Steven Hartland wrote:=0A=
> ----- Original Message ----- From: "Li, Qing" <qing.li@bluecoat.com>=0A=
>=0A=
>>> RTM_MISS: Lookup failed on this address: len 184, pid: 0, seq 0, errno=
=0A=
>>> 0, flags:<DONE>=0A=
>>> locks:  inits:=0A=
>>> sockaddrs: <DST>=0A=
>>>  ::A.B.C.D=0A=
>>>=0A=
I'm unable to reproduce an issue on (nearly) GENERIC 8-S, but I see=0A=
nearly the same situation on 8.1-S box with FLOWTABLE enabled.=0A=
=0A=
Do you have FLOWTABLE option in your kernel config ?=0A=
>>=0A=
>> Would it be possible for you to email me what exactly does "::A.B.C.D"=
=0A=
>> map into WRT your system or infrastructure ?=0A=
>=0A=
> Sorry for the slow reply been out of the country.=0A=
>=0A=
> All the hosts are local machines same /24 connecting to the server for=0A=
> mysql. It seems to be that every packet either to or from for the mysql=
=0A=
> server is generating an RTM_MISS.=0A=
>=0A=
>> And are you able to share your "ifconfig -a" and "netstat -rn" output=0A=
>> with me privately ?=0A=
>=0A=
> On its way.=0A=
>=0A=
>    Regards=0A=
>    Steve=0A=
>=0A=
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0A=
> This e.mail is private and confidential between Multiplay (UK) Ltd. and=
=0A=
> the person or entity to whom it is addressed. In the event of=0A=
> misdirection, the recipient is prohibited from using, copying, printing=
=0A=
> or otherwise disseminating it or any information contained in it.=0A=
> In the event of misdirection, illegible or incomplete transmission=0A=
> please telephone +44 845 868 1337=0A=
> or return the E.mail to postmaster@multiplay.co.uk.=0A=
>=0A=
> _______________________________________________=0A=
> freebsd-stable@freebsd.org mailing list=0A=
> http://lists.freebsd.org/mailman/listinfo/freebsd-stable=0A=
> To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"=
=0A=
>=0A=
=0A=
=0A=
- --=0A=
WBR, Alexander=0A=
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Version: GnuPG v2.0.18 (FreeBSD)=0A=
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/=0A=
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