Re: USB I/O performance

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On 09-09-05 08:22:36, Roberto Ragusa wrote:
> Tony Nelson wrote:
> > On 09-08-30 20:06:22, Roberto Ragusa wrote:
> >  ...
> >> I have a really slow flash (writes at 2MiB/s), so I tried to
> >> increase the number; the trick was impossible for me, the  
> >> parameter is refused when >120.
> > 
> > Just out of curiosity, what happens with 64?
> 
> 64 or 60 appears to slow it down a bit (2.5MiB/s becomes 2.2MiB/s).

Thanks.  So it's not just a "power of 2" issue.

I wonder if it is related to the size of an "erase" block (which I read 
are usually 64K, 128K, or 256K)?  When writing is slow, there may be 
lots of read/alter/rewrites happening, with extra wear on the flash.

-- 
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      '                              <http://www.georgeanelson.com/>

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