[plug] dd speed estimates and /dev/hdx grepping

[Ryan]

> I just did the same things again to another drive.
> 
> This time I passed:  bf24 ide0=dma ide1=dma unmaskirq=1   to the woody CD.
> 
> It took under 1 hour, and you could see from the redraw of the install
> program how little work the CPU was having to do compared to yesterday
> without DMA.
> 
> Without DMA it took somewhere between 6 and 18 hours.  Yes, I *could* be
> more vague if you asked ;P
> 
> So that's a speedup of at the very least, 6 times.
> 
> I used a 1MB blocksize as per Harry's inkling as the drives had a 2MB
> cache.
> I don't have the time to sit through more such tests just yet though,
> maybe
> later I might.

Roll on later ....

Just tried with a 32MB block size and it took the same amount of time.  This
being the case it took longer typing in the 32MB command and it is quicker
using 1MB :)

Ryan

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