Andrew Atrens wrote:
>
> On Sun, 17 Jan 1999, Karl Pielorz wrote:
>
> Karl,
>
> Let's see your (dmesg) probe messages ... :) they may shed some light on
> what's happening. I don't claim to be an expert on wd.c but from what I
> can tell it seems that controller and drive capabilities are pro
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> Date: Sun, 17 Jan 1999 20:51:42 +
> From: Karl Pielorz
> To: curr...@freebsd.org
> Subject: Problems with new IDE's & -current
>
> Hi,
>
> I have a system that's meant as a 'backup disk spool' - it has a 2Gb SCSI
> drive to
>> New models of IBM IDE drives are fast enough to consume a significant
>> fraction (perhaps > 100%) of PIO mode 4 bandwidth (16.6 MB/s). Don't
>> use them without DMA. Don't use them without UltraDMA (33.3 MB/s) if
>> you want full performance.
>
>I presume the last "don't" should have been a '
On Mon, 18 Jan 1999, Bruce Evans wrote:
> New models of IBM IDE drives are fast enough to consume a significant
> fraction (perhaps > 100%) of PIO mode 4 bandwidth (16.6 MB/s). Don't
> use them without DMA. Don't use them without UltraDMA (33.3 MB/s) if
> you want full performance.
I presume th
>> > The machine is a dual P90 (running SMP) - I get the problems even with a
>> > single CPU kernel... It's running Neptune chipset (quite old) - and only
>> > has 1 IDE channel.
>>
>> I would say that this has something to do with the DMA support, but since
>> Neptune's IDE controller isn't DMA
On Sun, Jan 17, 1999 at 09:29:19PM +, Karl Pielorz wrote:
>
>
> Lee Cremeans wrote:
>
> > > The machine is a dual P90 (running SMP) - I get the problems even with a
> > > single CPU kernel... It's running Neptune chipset (quite old) - and only
> > > has 1 IDE channel.
> >
> > I would say th
Lee Cremeans wrote:
> > The machine is a dual P90 (running SMP) - I get the problems even with a
> > single CPU kernel... It's running Neptune chipset (quite old) - and only
> > has 1 IDE channel.
>
> I would say that this has something to do with the DMA support, but since
> Neptune's IDE cont
On Sun, Jan 17, 1999 at 08:51:42PM +, Karl Pielorz wrote:
> Hi,
>
> I have a system that's meant as a 'backup disk spool' - it has a 2Gb SCSI
> drive to boot from, and then 2 x 16Gb IDE drives (IBM-DTTA-351680's).
>
> The system works fine so long as I stick to using the SCSI drives... If I u
Hi,
I have a system that's meant as a 'backup disk spool' - it has a 2Gb SCSI
drive to boot from, and then 2 x 16Gb IDE drives (IBM-DTTA-351680's).
The system works fine so long as I stick to using the SCSI drives... If I use
the IDE's (e.g. backup another machine to them, tar / untar 'usr/src' t
