Date: Thu, 3 Jun 1999 17:29:07 +0200 From: Jos Backus <Jos.Backus@nl.origin-it.com> To: Zhihui Zhang <zzhang@cs.binghamton.edu> Cc: freebsd-hackers@freebsd.org Subject: Re: The choice of MAXPHYS Message-ID: <19990603172907.A20792@hal.mpn.cp.philips.com> In-Reply-To: <Pine.GSO.3.96.990603101914.28480A-100000@sol.cs.binghamton.edu>; from Zhihui Zhang on Thu, Jun 03, 1999 at 10:40:10AM -0400 References: <Pine.GSO.3.96.990603101914.28480A-100000@sol.cs.binghamton.edu>
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On Thu, Jun 03, 1999 at 10:40:10AM -0400, Zhihui Zhang wrote:
> The value of MAXPHYS is chosen to be 64K for the maximum raw I/O transfer
> size. I am wondering why it is not set larger.
Just a guess: maybe this has something to do with DMA address counters on ISA
cards being 16 bit? (ducks) Or is this total nonsense? :-)
--
Jos Backus _/ _/_/_/ "Reliability means never
_/ _/ _/ having to say you're sorry."
_/ _/_/_/ -- D. J. Bernstein
_/ _/ _/ _/
Jos.Backus@nl.origin-it.com _/_/ _/_/_/ use Std::Disclaimer;
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