Date: Wed, 31 Jan 2001 12:23:11 -0800 (PST)
From: Matthew Jacob <mjacob@feral.com>
To: Dag-Erling Smorgrav <des@ofug.org>
Cc: Dan Nelson <dnelson@emsphone.com>, Seigo Tanimura <tanimura@r.dl.itc.u-tokyo.ac.jp>, arch@FreeBSD.ORG
Subject: Re: Bumping up {MAX,DFLT}*PHYS (was Re: Bumping up {MAX,DFL}*SIZ in i386)
Message-ID: <Pine.BSF.4.21.0101311222230.27098-100000@beppo.feral.com>
In-Reply-To: <xzphf2fo57y.fsf@flood.ping.uio.no>
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What do you mean for ISA? I thought you could do a lot more. Anyway, I mean, get real... PCI has been the main bus now for some years and it can do a full 32 bits.... let's move on now, please... On 31 Jan 2001, Dag-Erling Smorgrav wrote: > Dan Nelson <dnelson@emsphone.com> writes: > > On a similar note, is there any reason for us to have DFLTPHYS at 64k > > anymore? With the insane interface speeds of SCSI and ATA devices > > nowadays, you can easily hit 600 I/Os per second on sequential reads > > (40MB/sec, 64K per I/O). Would anything break if MAXPHYS/DFLTPHYS was > > bumped to say, 1mb? > > I think so; we can't do DMA transfers larger than 64k (128k in word > mode) - at least for ISA devices, I don't know much about PCI. > > DES > -- > Dag-Erling Smorgrav - des@ofug.org > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-arch" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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