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

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Date:	Tue, 22 Oct 2013 15:46:38 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	linux@...m.de
Cc:	hannes@...essinduktion.org, netdev@...r.kernel.org,
	klassert@...hematik.tu-chemnitz.de
Subject: Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4

From: Wolfgang Walter <linux@...m.de>
Date: Tue, 22 Oct 2013 21:07:41 +0200

> Am Mittwoch, 2. Oktober 2013, 00:20:02 schrieb Hannes Frederic Sowa:
>> On Tue, Oct 01, 2013 at 06:39:32PM +0200, Wolfgang Walter wrote:
>> > 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.
>> 
>> Maybe dropwatch can give a first hint?
>> 
> 
> I finally found the problem:
> 
> In 3.10.x and 3.11.x the value of /proc/sys/net/ipv4/xfrm4_gc_thresh is 1024.
> 
> It is much higher in 3.4.x. If I increase this value in 3.10.x to the one I 
> see on 3.4.x all works fine with 3.10.x

Steffen, here is yet another report about this issue.

I think we should resolve this soon, even bumping it to 2048 or 4096
and leaving it at that would be I think acceptable.

Thanks.
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