🚀 go-pugleaf

In article <39mmrb$rdr@bmerhc5e.bnr.ca> mlord@bnr.ca (Mark Lord) writes:
>On my own system, my MC2112A (1Gig) IDE gives blindingly fast read performance
>with settings up to 32, and then tapering off somewhat at higher settings,
>probably because the transfer of a "block" cannot begin until all of the 
>requested sectors of the block have been read (since PIO transfers are "blind"
>in mode0).  Thus with larger block sizes, there will be increased latencies,
>especially when a block spans more than one cylinder.

Does this also imply that a system of writing large block mode and reading
smaller block mode is better than a single setting to use for both ? Also on
drives supporting it would switching to DMA mode if the run queue is very full
get a useful trade off on disk performance for cpu availability and get more 
done overall ?

Alan
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 // Alan Cox  //  iialan@www.linux.org.uk   //  GW4PTS@GB7SWN.#45.GBR.EU  //
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