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

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Message-ID: <1382941051.13037.13.camel@edumazet-glaptop.roam.corp.google.com>
Date:	Sun, 27 Oct 2013 23:17:31 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
Cc:	Wolfgang Walter <linux@...m.de>,
	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

On Fri, 2013-10-25 at 11:20 +0200, Steffen Klassert wrote:
> On Fri, Oct 25, 2013 at 01:50:28AM -0700, Eric Dumazet wrote:
> > 
> > 32768 as the default seems fine to me
> > 
> > 448 bytes per dst -> thats less than 30 Mbytes of memory if we hit 65536
> > dst.
> > 
> 
> Ok, I'll add the patch below to to the ipsec tree if everyone is fine
> with that threshold.
> 
> Subject: [PATCH RFC] xfrm: Increase the garbage collector threshold
> 
> With the removal of the routing cache, we lost the
> option to tweak the garbage collector threshold
> along with the maximum routing cache size. So git
> commit 703fb94ec ("xfrm: Fix the gc threshold value
> for ipv4") moved back to a static threshold.
> 
> It turned out that the current threshold before we
> start garbage collecting is much to small for some
> workloads, so increase it from 1024 to 32768. This
> means that we start the garbage collector if we have
> more than 32768 dst entries in the system and refuse
> new allocations if we are above 65536.
> 
> Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
> ---

Sure please add :

Reported-by: Wolfgang Walter <linux@...m.de>

Thanks !


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