From: Gerhard Sittig <gsi-ynQEQJNshbs@public.gmane.org>
To: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org>,
Anatolij Gustschin <agust-ynQEQJNshbs@public.gmane.org>,
linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH RFT] spi: mpc512x-psc: Refactor to use core message parsing
Date: Sat, 29 Mar 2014 15:18:51 +0100 [thread overview]
Message-ID: <20140329141851.GB2775@book.gsilab.sittig.org> (raw)
In-Reply-To: <20140327182049.GT30768-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
On Thu, 2014-03-27 at 18:20 +0000, Mark Brown wrote:
>
> Can you try turning the
> tracepoints on and see if they show where the delays are? Both the
> message pump and transfer loops have a reasonable number of tracepoints
> in them.
I did a 'dd if=/dev/mtd6 bs=1K' on an m25p80 chip. Gathered
traces suggest that each 1KB block leads to two transfers. The
second (the data part) takes several milliseconds (saw some
3-10ms for 1024 bytes :-O ). But I fail to see what might take
this long. Will need to dig deeper.
virtually yours
Gerhard Sittig
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next prev parent reply other threads:[~2014-03-29 14:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-27 15:05 [PATCH RFT] spi: mpc512x-psc: Refactor to use core message parsing Axel Lin
2014-03-27 17:24 ` Gerhard Sittig
[not found] ` <20140327172416.GW3998-kDjWylLy9wD0K7fsECOQyeGNnDKD8DIp@public.gmane.org>
2014-03-27 18:20 ` Mark Brown
[not found] ` <20140327182049.GT30768-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2014-03-29 14:18 ` Gerhard Sittig [this message]
[not found] ` <20140329141851.GB2775-kDjWylLy9wD0K7fsECOQyeGNnDKD8DIp@public.gmane.org>
2014-03-31 7:54 ` Gerhard Sittig
[not found] ` <20140331075403.GF2775-kDjWylLy9wD0K7fsECOQyeGNnDKD8DIp@public.gmane.org>
2014-03-31 9:41 ` Mark Brown
2014-03-29 15:09 ` Gerhard Sittig
[not found] ` <20140329150910.GC2775-kDjWylLy9wD0K7fsECOQyeGNnDKD8DIp@public.gmane.org>
2014-03-30 0:30 ` Mark Brown
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