USB I/O performance
Tony Nelson
tonynelson at georgeanelson.com
Sat Sep 5 16:46:44 UTC 2009
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.
--
____________________________________________________________________
TonyN.:' <mailto:tonynelson at georgeanelson.com>
' <http://www.georgeanelson.com/>
More information about the fedora-list
mailing list