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FS performance with SD/MMC card

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From: Kallol Biswas <nucleodyne@...>
To: <linux-kernel@...>
Subject: FS performance with SD/MMC card
Date: Monday, April 28, 2008 - 4:51 pm

Hi,

  Someone has asked how fast can a linux FS  write to a SD/MMC card?


Answer to this will help make a product decision.


Kallol Biswas

NucleoDyne Systems, Inc.

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From: Ed Tomlinson <edt@...>
To: Kallol Biswas <nucleodyne@...>
Cc: <linux-kernel@...>
Subject: Re: FS performance with SD/MMC card
Date: Monday, April 28, 2008 - 6:32 pm

Hi,


Take a look at:


http://intr.overt.org/blog/?p=66


The problem he mentions is due to dynamic cpu speed scaling to save power.  When its disabled 12.9M/s comes back...


The support for high speed is in the stock linux kernel.  Nokia's kernel drops it since some of the HW

they use for the SD card support has problems with the high speed...


Thanks

Ed 


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