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Re: [ts-7000] Re: New SD card driver.

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Subject: Re: [ts-7000] Re: New SD card driver.
From: Paulo Marques <>
Date: Fri, 02 Feb 2007 18:11:01 +0000
hamishavery wrote:
> Gidday,
> 
> Has anyone else tried this new driver?  I am having problems getting
> over 60kB write speed when mounting any of my SD cards as 'sync' with
> this driver.  Does anyone have any thoughts on what could be causing
> this discrepency? 

Forcing the kernel to use "sync" mode is very bad for your performance, 
because the kernel won't be able to coalesce any writes, even writes for 
the same sectors.

It should be much better to use async and to tune your kernel so that 
the dirty data size doesn't grow so much that it becomes a problem.

I hope this helps,

-- 
Paulo Marques
Software Development Department - Grupo PIE, S.A.
Phone: +351 252 290600, Fax: +351 252 290601
Web: www.grupopie.com



 
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