linux-kernel - Re: Huge performance degradation for UDP between 2.4.17 and 2.6

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Message-ID: <501B5DAC.7070400@genband.com>
Date:	Thu, 02 Aug 2012 23:12:12 -0600
From:	Chris Friesen <chris.friesen@...band.com>
To:	leroy christophe <christophe.leroy@....fr>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Huge performance degradation for UDP between 2.4.17 and 2.6

On 08/02/2012 06:27 AM, leroy christophe wrote:
> Hi
>
> I'm having a big issue with UDP. Using a powerpc board (MPC860).
>
> With our board running kernel 2.4.17, I'm able to send 160000 voice 
> packets (UDP, 96 bytes per packet) in 11 seconds.
> With the same board running either Kernel 2.6.35.14 or Kernel 3.4.7, I 
> need 55 seconds to send the same amount of packets.
>
>
> Is there anything to tune in order to get same output rate as with 
> Kernel 2.4 ?

Have you tried profiling it to see where the time is being spent?  Also 
turning off any unnecessary features, debugging, etc?

Chris
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