Re: [PATCH] Configure IDE probe delays

From: Mark Lord (lkml_at_rtr.ca)
Date: 08/03/04

  • Next message: Luben Tuikov: "Re: [2.6 patch] let AIC7{9,X}XX_BUILD_FIRMWARE depend on!PREVENT_FIRMWARE_BUILD" 
    Date:	Tue, 03 Aug 2004 13:47:06 -0400
To: Jeff Garzik <jgarzik@pobox.com>

    I'm the dude responsible for the infamous "50 milliseconds" here.

    I agree that (1) it is overkill, (2) it could be optimised,
    and (3) it is very very non-standard.

    But it also works extraordinarilly well. I still am very active
    with ATA and SATA driver development, and the basic Linux IDE probe
    works for me on vendor hardware where their own standards-specific
    routines sometimes fail (even in their windows drivers).

    If possible, it would be best to let it be, and over time it will
    be less and less important as SATA and kin take over the universe.

    Every time I tried to tweak it to be faster, it seemed to break
    some system or another.

    One possibility here would be to augment it with reset signature probing,
    and/or a cyl-high read/write test. These could speed things up for
    more mainstream cases. But I'm not going to touch what's there myself!

    Cheers 

    -- 
Mark Lord
(hdparm keeper & the original "Linux IDE Guy")
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