Date: Mon, 20 Apr 1998 09:56:56 -0700 From: Mike Smith <mike@smith.net.au> To: Karl Pielorz <kpielorz@tdx.co.uk> Cc: Mike Smith <mike@smith.net.au>, hardware@FreeBSD.ORG Subject: Re: best wdc0 flags ? Message-ID: <199804201656.JAA00786@dingo.cdrom.com> In-Reply-To: Your message of "Mon, 20 Apr 1998 17:42:20 BST." <353B7AEC.D560BAD7@tdx.co.uk>
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> Mike Smith wrote: >> >>>>>> I tried those flags and noticed that it turned on 32-bit transfers for >>>>>>my wd0, resulting in a 20% increase in throughput. Out of curiosity, why >>>>>>aren't these flags included in GENERIC? >>>>> >>>>> Becuase they break operation of drives that don't support them. >>>> >>>>Do we have any examples of controllers that don't? >>> >>> I thought I did, but my oldest accessible drive (all 400MB of it from >>> 4 years ago) supports them. The probe seems to handle any that don't. >> >> OK. Should we make it the default then? > > Not a good idea... 32 bit transfers cause my nice shiny new Fireball 4.3Gb > SE's to barf (this is on a 440FX chipset 'embeded' controller). Have you tried enabling DMA? (0xa0ffa0ff) Also check your BIOS configuration to make sure that the disks are set up correctly (PIO mode, etc.) > A bit annoying - but probably expected from Quantum... <g> Not really. They *ought* to work - certainly we're seeing 32-bit transfers working on other SE-series drives just fine. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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