netdev - Re: unstable 10GBE performance with recent kernels (> 3.0.X)

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Date:	Mon, 18 Jun 2012 15:29:04 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stefan Priebe - Profihost AG <s.priebe@...fihost.ag>
Cc:	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: unstable 10GBE performance with recent kernels (> 3.0.X)

On Mon, 2012-06-18 at 15:07 +0200, Stefan Priebe - Profihost AG wrote:
> Am 18.06.2012 14:51, schrieb Eric Dumazet:
>  > On Mon, 2012-06-18 at 14:36 +0200, Stefan Priebe - Profihost AG wrote:
>  >> Am 18.06.2012 12:25, schrieb Eric Dumazet:
>  >>> I would remove all this (pretty old and obsolete) stuff and use 
> standard
>  >>> params.
>  >> OK, thanks. done.
>  >>
>  >> I've one RHEL6 system (using default 2.6.32 kernel) where only using
>  >> "ntuple on" results in just 4-5Gbit/s while the others using 3.5.0-rc2
>  >> are working fine.
>  >>
>  >
>  > OK, then you might play with affinities, that's the only thing that
>  > might need sysadmin tuning (irqbalance needs to be disabled)
> 
> I've now used this one:
> 
> # script provided by intel
> /root/set_irq_affinity.sh eth2
> ifconfig eth2 mtu 9000
> ethtool -K eth2 ntuple on
> 
> irqbalance is off
> 
> But with the latest long term stable vanilla kernel 3.0.34.
> 
> # iperf -c HOST -t 60
> 
> works fine but with -d for using both directions i see around 9.8Gbit/s 
> in one direction and only 300kb/s in the other direction.
> 
> Stefan


I would try using regular MTU.

And post "netstat -s" results before/after your iperf.




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