Low write throughput with arm/jffs2/nand

[Artem B. Bityuckiy]

On Mon, 7 Feb 2005, Sergei Sharonov wrote:
> Hi,
> 
> Around Jan 18 nand_wait() function in nand_base.c was changed to 
> use msleep(1) instead of yield(). While it is sort of OK on x86
> with its default HZ=1000 (linux 2.6) it slows down the throughput
> on arm where the default is HZ=100. What I believe is happening:
> - on the first pass flash is not ready
> - msleep(1) is invoked, but it actually sleeps 10 or 20 ms
> 
> What will be the right way of fixing that? Replacing msleep(1) with
> yield() does it but philosophically is probably not the right thing 
> to do, changing HZ is much worse..
> 
> Sergei
> 
> P.S. What is the best read/write speed you people are getting with 
> jffs2/nand?
This is highly depended on whether you use compression and the compression 
mode.

> 
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--
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.