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

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Date:	Wed, 23 Oct 2013 13:33:14 +0200
From:	Wolfgang Walter <linux@...m.de>
To:	Steffen Klassert <steffen.klassert@...unet.com>
Cc:	David Miller <davem@...emloft.net>, 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

Am Mittwoch, 23. Oktober 2013, 10:12:55 schrieb Steffen Klassert:
> On Tue, Oct 22, 2013 at 03:46:38PM -0400, David Miller wrote:
> > 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.
> 
> Yes, of course. Let's use 4096 as the default for ipv4 and ipv6.
> I'll take care of it next week.
> 

I don't know what this value actually means. But on 3.4.x it is much higher. 
On a machine with 512MB ram it is 32768, on a machine with 1GB ram it is 
262144 and with 16GB ram it is 4194304.

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