Date: Wed, 21 Mar 2001 13:11:28 -0800 From: Mike Smith <msmith@freebsd.org> To: Poul-Henning Kamp <phk@freebsd.org> Cc: arch@freebsd.org Subject: Re: remind me again, why is MAXPHYS only 128k ? Message-ID: <200103212111.f2LLBSh01790@mass.dis.org> In-Reply-To: Your message of "Wed, 21 Mar 2001 22:00:51 %2B0100." <88825.985208451@critter>
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> Are there any roadblocks for increasing MAXPHYS as a tweakable these
> days, or is it still an "do not alter or ELSE..." #define ?
There isn't much hardware out there that can do anything useful with an
I/O larger than 128k. There was also a lengthy discussion on I/O
saturation a little while back; the short answer is just that making it
larger doesn't win anything significant, and may cause unacceptable
latencies in some cases.
--
... every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
V I C T O R Y N O T V E N G E A N C E
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