serious packet routing issue causing ntpd high load?

[Vlad Galu]

Hi Qing,

Any luck with this?

Thanks
Vlad

On Thu, Nov 3, 2011 at 2:05 PM, Li, Qing <qing.li at bluecoat.com> wrote:

> 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 at FreeBSD.org]
> Sent: Thursday, November 03, 2011 6:43 AM
> To: Steven Hartland
> Cc: Li, Qing; freebsd-stable at FreeBSD.org; liv3d at 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 at 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
> >
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>
> - --
> WBR, Alexander
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