[Linux-ia64] Re: PCI DAC routines for SN

From: Jesse Barnes <jbarnes_at_sgi.com>
Date: 2002-04-25 11:01:59
On Wed, Apr 24, 2002 at 05:43:18PM -0700, David S. Miller wrote:
> We don't add things to Linux that we "might need" we add things
> we actually need.  It is a slight performance problem too.

I fully understand and agree with that, and I don't propose adding the
call just for the fun of it.  It's just that most of the time, it's
easier software-wise to use the 64 bit consistent mappings if your
device can support it (e.g. generic ia64, ia64/sn).

> I don't think the hardware folks would be happy to hear that you're
> willing to sacrifice real hardware cycles just for some DAC nirvana
> or whatever it is you have for this issue.

I don't think the performance impact of those extra cycles would be
measurable, but I'd be happy to see any numbers you might have to the

Received on Wed Apr 24 18:03:14 2002

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