DMA works fine on CURRENT Wd disks. There was an issue with an earlier disk.
just a simple test on my Mandrake7.0 box with a single WD 27 GIG drive.
(Using bonnie)
Fresh reboot, no hdparm:
-------Sequential Output-------- ---Sequential
Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per
Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec
%CPU
100 4261 73.5 5092 7.5 1776 19.8 2928 71.9 3956 18.5 288.7
8.3
Reboot again. Then hdparm -d1c1 /dev/hda (then run bonnie again)
-------Sequential Output-------- ---Sequential
Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per
Char- --Block--- --Seeks---
Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec
%CPU
100 7919 99.3 28024 30.9 9332 20.8 7509 86.8 19223 16.9 440.1
2.4
That's a pretty good improvement for a drive that isn't susposed to work at
all in UDMA mode.
--
Don Krause [EMAIL PROTECTED]
> -----Original Message-----
> From: bobby dowling [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, June 07, 2000 5:04 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [Cooker] 32 bit i/o for hard drive
>
>
> Well, it looks like you got lucky. I have a 13 gig and an 8
> gig WD and they
> are both slow. The funny thing is that the 8 gig is a 5400
> rpm drive and
> hdparm says it is a shade faster than the 13 gig drive, which
> is a 7200 rpm
> drive...go figure. ...around 4.7 megs/sec each.
>
> I wish I knew this before I bought the drives. I got them at
> Best Buy and
> they sale both WD and Maxtor drives ...it was a flip of the coin then
> ...should have done my research ...maybe next time!! :)
>
>
> >From: Sebastian Dransfeld <[EMAIL PROTECTED]>
> >Reply-To: [EMAIL PROTECTED]
> >To: [EMAIL PROTECTED]
> >Subject: Re: [Cooker] 32 bit i/o for hard drive
> >Date: Thu, 8 Jun 2000 00:24:36 +0200 (MET DST)
> >MIME-Version: 1.0
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> >From [EMAIL PROTECTED] Wed Jun 07 15:29:33 2000
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> owned process
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> >
> >On Wed, 7 Jun 2000, bobby dowling wrote:
> >
> > > So, there is no way to use DMA on WD drives? Man, this
> stinks. Why are
> >WD
> > > hard drives so much slower than others? It seems like
> this would be
> >widely
> > > know and people wouldn't but them.
> >
> >Model=WDC AC310200R
> >
> >This one works with standard Mandrake hdparm options.
> >
> >Timing buffered disk reads: 64 MB in 5.10 seconds = 12.55 MB/sec
> >
> >It's okay.
> >
> >seb
> >
>
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