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 14:57:33 -0400
From:	Brian Haley <brian.haley@...com>
To:	Wolfgang Walter <linux@...m.de>, netdev@...r.kernel.org
Subject: Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4

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.

-Brian
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