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    SubjectRe: [resent PATCH] Re: very slow parallel read performance
    Date
    On August 26, 2001 10:26 pm, Gérard Roudier wrote:
    > On Sun, 26 Aug 2001, Daniel Phillips wrote:
    >
    > [...]
    >
    > > It should not be being ignored. This needs to be looked into. In any event,
    > > the max-readahead proc setting is clearly good and needs to be in Linus's
    > > tree, otherwise changing the default MAX_READAHEAD requires a recompile.
    > > Worse, there is no way at all to specify the kernel's max-readahead for scsi
    > > disks - regardless of the fact that scsi disks do their own readahead, the
    > > kernel will do its own as well, with no way for the user to turn it off.
    >
    > For SCSI disks prefetch tuning you may look into the CACHING page.
    >
    > For example, you can tell the drive to stop prefetching as soon a command
    > is ready by setting MINIMUM PRE-FETCH to zero.
    >
    > Unfortunately, not all SCSI disks allow to tune all the configuration
    > parameters of the caching page.

    In this case he's using ide.

    --
    Daniel
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