Subject: Re: pciide performance on alpha
To: Ken Wellsch <email@example.com>
From: Jason Thorpe <firstname.lastname@example.org>
Date: 08/12/1999 09:59:31
On Thu, 12 Aug 1999 09:30:53 -0400 (EDT)
Ken Wellsch <email@example.com> wrote:
> I believe Andreas mentioned working with a PC164SX? I too have an SX.
> I guess I should have sprung for the extra $$'s and got an LX like all
> the other alpha folks in-the-know as I too have noted the anemic EIDE
> performance vs the same drive and OS on an i386 platform (both using plain
> DMA). When I moved my IBM drive from my PPro box to my SX box, I "lost"
> at least 50% and I'd claim 75% on transfer rates, based on bonnie
> measurements at that time.
Note that the 164SX has a wimpy memory bus speed compared to the 164LX
and the original PC164 (which had the best of all of them, actually). This
If you get better transfer rates on the *same machine* under a different
OS (as was implied earlier in the thread, I think), then there may be
a problem with how we initialize the Cypress controller... but that
would be the only issue; the vast majority of the PCI IDE code is
shared between all controller types.
-- Jason R. Thorpe <firstname.lastname@example.org>