lkml.org 
[lkml]   [2001]   [Aug]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:58    [from the cache]
©2003-2011 Jasper Spaans. Advertise on this site