Date: Wed, 21 Mar 2001 13:26:21 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Mike Smith <msmith@FreeBSD.ORG> Cc: Poul-Henning Kamp <phk@FreeBSD.ORG>, arch@FreeBSD.ORG Subject: Re: remind me again, why is MAXPHYS only 128k ? Message-ID: <Pine.LNX.4.21.0103211326040.12896-100000@zeppo.feral.com> In-Reply-To: <200103212111.f2LLBSh01790@mass.dis.org>
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On Wed, 21 Mar 2001, Mike Smith wrote: > > > > 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. That was maybe only one person's opinion. It was not a consensus by any means. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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