hdparms settings (was: [ale] Memory > 64 M)

[Jeff Hubbs]

Do bear in mind that the result of hdparm -t is just *one kind* of disk
operation (buffered reads).  IMHO, this means that you probably shouldn't
sweat that counterintuitive discrepancy.

- Jeff

> -----Original Message-----
> From: Joe Knapka [mailto:jknapka at charter.net]
> Sent: Monday, July 10, 2000 8:05 PM
> To: ale at ale.org
> Subject: Re: hdparms settings (was: [ale] Memory > 64 M)
> 
> 
> Regarding http://www.frankenlinux.com.guides/tweaks.html
> 
> This is interesting. My Slack 7.1 machine had DMA turned
> on by default, but not 32-bit I/O.
> 
> Here are my results with all combinations:
> 
> DMA        32-bit      MB/S
> ----------------------------
> 0          0           5.0
> 0          1           6.5
> 1          0           8.7
> 1          1           8.5
> 
> I did this several times, with pretty
> consistent results. The HD is not ATA66, but it
> still seems a bit surprising that DMA and 32-bit
> I/O both independently improve performance, but
> together they don't do as well as DMA alone.
> I wonder if this is an HD issue, a mobo/chipset
> issue, or a combination of things?
> 
> (This experiment was done on a Tyan S1598 mobo
> with a WD Caviar 22500 HD.)
> 
> -- Joe
> 
> Jim Popovitch wrote:
> > 
> > Hey Rob, Thanks for the link, especially the part about 
> 32bit access.
> > I
> > got a 350% improvement right away.  Thanks!
> > 
> > -Jim P.
> > 
> > --- Robert Hoffman <rob at frankenlinux.com> wrote:
> > > This happens on some motherboards. I've got a little 
> guide to fixing
> > > the memory problem here:
> > >
> > > www.frankenlinux.com/guides/tweaks.html
> > >
> > > -Rob Hoffman
> > >
> > > ---------- Original Message ----------------------------------
> > > From: Armsby John-G16665 <John.Armsby at motorola.com>
> > > Date: Mon, 10 Jul 2000 08:05:28 -0400
> > >
> > > >I upgraded my memory on the Pentium II box I have.  I have RedHat
> > > >5.1(2.0.35).  I read that I have to pass the memory parameter at
> > > boot. I
> > > >have tried the following, both failed.  The PC locked up during
> > > initial
> > > >start up right about when it is accessing the file system.
> > > >
> > > >
> > > >boot:  Linux mem=97M         Failed.
> > > >
> > > >Using the GUI tool associated with windows 95 knockoff (LILO
> > > configuration)
> > > >mem=97M      Failed.
> > > >
> > > >The machine is smart enough to the 64 meg by default.
> > > >
> > > >I am sure there is a something simple I have missed.
> > > >
> > > >
> > > >
> > > >
> > > >I could upgrade but that is another story.  When I have tried to
> > > upgrade
> > > >(5.2, 6.1), my Creative DAD CD-ROM (ATAPI) refuses to talk to the
> > > pci 128
> > > >SoundBlaster.  Funny thing is I can get REAL PLAYER to work fine
> > > with both
> > > >upgrades.  At present the CD-ROM talks to the 
> SoundBlaster via the
> > > $35
> > > >driver I bought from FourFront Technologies... Works great.
> > > >
> > > >
> > > >
> > > >
> > > >John
> > > >--
> > > >To unsubscribe: mail majordomo at ale.org with "unsubscribe ale" in
> > > message body.
> > > >
> > > --
> > > To unsubscribe: mail majordomo at ale.org with "unsubscribe ale" in
> > > message body.
> > 
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> 
> -- Joe Knapka
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