netdev - Re: [PATCH net 3/3] slcan: rewrite of slc_bump and slc

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Message-ID: <523AC84D.5030305@pengutronix.de>
Date:	Thu, 19 Sep 2013 11:47:57 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Andre Naujoks <nautsch2@...il.com>
CC:	davem@...emloft.net, Wolfgang Grandegger <wg@...ndegger.com>,
	linux-can@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 3/3] slcan: rewrite of slc_bump and slc_encaps

On 09/13/2013 07:37 PM, Andre Naujoks wrote:
> The old implementation was heavy on str* functions and sprintf calls.
> This version is more manual, but faster.
> 
> Profiling just the printing of a 3 char CAN-id resulted in 60 instructions
> for the manual method and over 2000 for the sprintf method. Bear in
> mind the profiling was done against libc and not the kernel sprintf.
> 
> Together with this rewrite an issue with sending and receiving of RTR frames
> has been fixed by Oliver for the cases that the DLC is not zero.
> 
> Signed-off-by: Andre Naujoks <nautsch2@...il.com>
> Tested-by: Oliver Hartkopp <socketcan@...tkopp.net>
Acked-by: Marc Kleine-Budde <mkl@...gutronix.de>

regards,
Marc
-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
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