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Date:	Thu, 24 Oct 2013 00:52:58 +0200
From:	Wolfgang Walter <linux@...m.de>
To:	Eric Dumazet <eric.dumazet@...il.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

On Wednesday 23 October 2013 10:06:32 Eric Dumazet wrote:
> On Wed, 2013-10-23 at 18:59 +0200, Wolfgang Walter wrote:
> > Ah, ok. I use SLUB, but SLABINFO=y.
> > 
> > Without much traffic it is:
> > 
> > # grep dst /proc/slabinfo
> > xfrm_dst_cache      4435   4608    448   36    4 : tunables    0    0    0
> > : slabdata    128    128      0
> > 
> > on the big one.
> > 
> > I can recompile the kernels with SLAB instead of SLUB if SLAB gives more
> > usefull infos.
> Not needed, because it seems we do not merge this SLUB cache with
> another one.

Ok. I can't see xfrm_dst_cache on 32bit-systems, though.

> 
> So please post this information, because I believe the default should be
> 65536, not 1024 or 4096
> 

Indeed I already saw higher values, at the moment I see:

# while true; do grep dst /proc/slabinfo ; sleep 1; done
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12636  12636    448   36    4 : tunables    0    0    0 : slabdata    351    351      0
xfrm_dst_cache     12708  12708    448   36    4 : tunables    0    0    0 : slabdata    353    353      0
xfrm_dst_cache     11529  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11599  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11599  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11599  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11599  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11599  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11599  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11599  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11599  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11599  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11599  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11633  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11633  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11633  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11700  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11763  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11798  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     11964  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     12139  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     12244  12276    448   36    4 : tunables    0    0    0 : slabdata    341    341      0
xfrm_dst_cache     12312  12312    448   36    4 : tunables    0    0    0 : slabdata    342    342      0
xfrm_dst_cache     12492  12492    448   36    4 : tunables    0    0    0 : slabdata    347    347      0



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

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