[TriLUG] OT: hd speed with 33MHz and 100MHz controller are the same

[Joseph Mack NA3T]

On Tue, 12 Jun 2007, Robert Dale wrote:

> The bus probably is 33MHz, 66MHz at most.  And it probably is the bottleneck.
> Just as you wouldn't expect to Gb speeds on a 10baseT network just
> because you plug in a GigE card.

I hadn't realised there was as much happening between the 
CPU and the disk. Since badblocks is writing the same data 
over and over, I would have thought it would all be cached.

It's taken overnight to write the first 0xaaaaaaaa bits to 
the disk. It's just started to read them back. It will be 4 
days before its finished my new 320G disk at 33MHz.

> A better benchmark would be to use something like bonnie++ [1] on each
> disk separately and compare numbers.  It measures raw throughput
> through various tests - it does not try to verify data like badblocks
> (which potentially could be cpu bound).  You can also limit the size
> of files.

will give it a go in 4 days ;-) thanks

Joe

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Joseph Mack NA3T EME(B,D), FM05lw North Carolina
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