Could you please only quote the relevant parts, particularly, would you
erase deeper nesting of quotes in your replies? That'd help a lot of
people transfer less data they can still easily get from their own
mailer at a keypress. Thanks a lot.
On Tue, 25 Sep 2001, Jorge Nerín wrote:
> Who says test.zero is a linear file and it's not scattered around the
> whole disk and the fs layer is filling holes...? If it's the case the
> write cache is a BIG win, just think that the fs writes a chunk at the
> beggining of the disk, then another chunk at the end, then another near
> the beginning, then... you get the picture, in this case the disk
> reorders the seeks to best fit.
> If you want to try a REAL linear write do a dd if=/dev/zero of=/dev/hde7
> or whatever unused partition you have.
I did, and it showed almost the same behaviour, twice as fast with write
cache turned on.
Scattering the writes would (usually) only happen on a nearly filled
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This archive was generated by hypermail 2b29 : Sun Sep 30 2001 - 21:00:30 EST