netdev - Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4

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Date:	Tue, 01 Oct 2013 21:44:10 +0200
From:	Wolfgang Walter <linux@...m.de>
To:	Brian Haley <brian.haley@...com>
Cc:	netdev@...r.kernel.org
Subject: Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4

Am Dienstag, 1. Oktober 2013, 14:57:33 schrieb Brian Haley:
> On 10/01/2013 12:39 PM, Wolfgang Walter wrote:
> > Hello,
> > 
> > I tried to upgrade one of our routers to 3.10.13 from 3.4.63 and I see a
> > dramatic performance loss. I tried 3.11.2 and it is still there.
> > 
> > *** Symptoms:
> > 
> > All network traffic over the router become slow and sluggish. If one pings
> > the router there is a packet loss. After about 2 minutes the traffic
> > completely stalls for about 1 minute. Then it works again as in the
> > beginning to then stall again. And so on.
> > 
> > This happens even with rather moderate traffic. While still routing the
> > CPU
> > utilization is higher than it is with 3.4.63 but only moderately.
> > 
> > When it stalls no network traffic seems possible (but to loopback). If one
> > tries to ping from the router any target (even if it is on a interface
> > with no> 
> > traffic at all) one gets:
> > 	ping: sendmsg: No buffer space available
> 
> dmesg show anything?  I've seen this happen when the neighbour table is
> full, but that's not a typical occurence.
> 

Nothing is logged.

No, the neighbour table is not full. At least is does not contain more entries 
then usually and not more then under 3.4 (maybe 100 or so).

I also checked the number of entries in the conntrack table and things like 
that: all normal.

Regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
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