Date: Mon, 11 Aug 1997 17:50:45 -0700 From: Mike Haertel <mike@ducky.net> To: Curt Sampson <cjs@portal.ca> Cc: freebsd-hackers@FreeBSD.ORG, freebsd-hardware@FreeBSD.ORG Subject: Re: question about "ed" driver performance on ASUS SP3G & 486DX4/100 Message-ID: <199708120050.RAA04916@ducky.net> In-Reply-To: Your message of "Mon, 11 Aug 1997 08:48:02 PDT." <Pine.NEB.3.96.970811084706.8496C-100000@cynic.portal.ca>
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>> I tried 16-bit copies; they were a little slower (about 16 and 18 >> seconds on the P5-90 and 486-100 respectively). > >I'd be interested to see what you get with 8-bit copies. Did you >drop the board into 16-bit mode before doing your 16-bit reads, >BTW? I'm not sure if it makes a difference on reads, but it certainly >does on writes. 8 bit copies were 1.5 times as slow as 16-bit copies--about .65 megabytes/sec. I tried both rep movsb and manually unrolled movb's. At this point, I've concluded the board is probably at fault...
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