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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Peter Korsgaard <jacmet@sunsite.dk>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 01/12] ARM zImage: do memmap if possible
Date: Tue, 30 Mar 2010 14:18:01 +0200	[thread overview]
Message-ID: <20100330121801.GL2241@pengutronix.de> (raw)
In-Reply-To: <87r5n2b01l.fsf@macbook.be.48ers.dk>

On Tue, Mar 30, 2010 at 12:01:42PM +0200, Peter Korsgaard wrote:
> >>>>> "Sascha" == Sascha Hauer <s.hauer@pengutronix.de> writes:
> 
> Hi,
> 
>  >> Here you're rereading the header as well, instead of everything past
>  >> it like the normal case.
> 
>  Sascha> Yes, mostly because I was too lazy to calculate the offsets.
> 
> You could just have copied it from the line above ;)
> 
>  >> Does this give a significant boost? read() from something memmap'able
>  >> (like NOR) boils down to a memcpy as well, right?
> 
>  Sascha> Hmm, with memmap it's 149ms and with read 156ms in my case. I
>  Sascha> think this is because with memmap it goes down to a single
>  Sascha> memcpy whereas with read we memcpy in chunks of 4k. I
>  Sascha> implemented this out of reflex, but maybe it's really not worth
>  Sascha> the added complexity.
> 
> I imho don't think it's worth it. One of barebox' big advantages is how
> readable and clean the source code is.

Ok, I'll drop this patch.

Sascha


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  reply	other threads:[~2010-03-30 12:18 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-29  9:36 Patches for next merge window Sascha Hauer
2010-03-29  9:36 ` [PATCH 01/12] ARM zImage: do memmap if possible Sascha Hauer
2010-03-29 18:47   ` Peter Korsgaard
2010-03-30  9:20     ` Sascha Hauer
2010-03-30 10:01       ` Peter Korsgaard
2010-03-30 12:18         ` Sascha Hauer [this message]
2010-03-29  9:36 ` [PATCH 02/12] nand_imx: use optimized memcpy Sascha Hauer
2010-03-29  9:36 ` [PATCH 03/12] nand_imx: Speed up sequential read Sascha Hauer
2010-03-29  9:36 ` [PATCH 04/12] imx_nand: use memcpy for copying from/to buffer Sascha Hauer
2010-03-29 10:42   ` Ivo Clarysse
2010-03-29  9:36 ` [PATCH 05/12] add unaligned access support Sascha Hauer
2010-03-29  9:36 ` [PATCH 06/12] add unlzo support Sascha Hauer
2010-03-30 11:04   ` Sascha Hauer
2010-03-29  9:36 ` [PATCH 07/12] add snprintf function Sascha Hauer
2010-03-29  9:36 ` [PATCH 08/12] echo: add -e option support Sascha Hauer
2010-03-30 11:45   ` Peter Korsgaard
2010-03-30 12:17     ` Sascha Hauer
2010-03-29  9:36 ` [PATCH 09/12] add process_escape_sequence function Sascha Hauer
2010-03-29  9:36 ` [PATCH 10/12] echo command: Add -e option Sascha Hauer
2010-03-29  9:36 ` [PATCH 11/12] hush: only remove backslashes introduced from glob Sascha Hauer
2010-03-29 10:00   ` Sascha Hauer
2010-03-29  9:36 ` [PATCH 12/12] hush: allow fancy prompts Sascha Hauer

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