Date: Fri, 23 Aug 1996 09:29:19 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: rgrimes@GndRsh.aac.dev.com (Rodney W. Grimes) Cc: pjchilds@imforei.apana.org.au, se@zpr.uni-koeln.de, msmith@atrad.adelaide.edu.au, freebsd-hardware@FreeBSD.org Subject: Re: ASUS SC200 SCSI card? Message-ID: <199608222359.JAA17181@genesis.atrad.adelaide.edu.au> In-Reply-To: <199608222347.QAA13093@GndRsh.aac.dev.com> from "Rodney W. Grimes" at Aug 22, 96 04:47:01 pm
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Rodney W. Grimes stands accused of saying: > > > > > [ Discussion about hangs on 2.1.5-stable machine with dual ASUS SC200 > > NCR810 PCI scsi controllers follows... may be dangerous to > > mental health ] > ... > > > 2. PCI latency was set to 80... Michael Smith suggested it be lower than > > 32 to i've moved it to 20. > > Set it to exactly 32, no more, no less. ASUS and others have done > 100's of hours of testing and this was found to be the best setting. Even with two 810's coming up for an opcode every us? I'd have thought you'd want to allow for (max latency + one opcode fetch) < 1us so that the second one didn't starve... > Rod Grimes rgrimes@gndrsh.aac.dev.com -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[
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