Date: Wed, 6 Jan 1999 15:28:14 -0800 From: "Jon Burchmore" <burch@offline.org> To: "Albert Max Lai" <amlai@columbia.edu> Cc: <AIC7xxx@FreeBSD.ORG> Subject: RE: aic performance (Was Re: SCSI speed with IBM DGVS09U (8 GB) hard drive, Linux) Message-ID: <007401be39cc$3b96c200$1638a8c0@gobook2.htmlscript.com> In-Reply-To: <Pine.GSO.3.95qL.990106173645.26383G-100000@konichiwa.cc.columbia.edu>
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> /dev/sda: > Timing buffer-cache reads: 64 MB in 0.64 seconds =100.00 MB/sec > Timing buffered disk reads: 32 MB in 2.00 seconds =16.00 MB/sec I haven't really been following this thread, but I'll assume that those numbers were obtained on a P2/U2W system. I'm getting the following numbers out of my Dual Pentium 200MHz system w/2940UW and a WD Enterprise 4.2GB UW drive (Linux 2.1.131-ac11): /dev/sda: Timing buffer-cache reads: 64 MB in 1.96 seconds =32.65 MB/sec Timing buffered disk reads: 32 MB in 6.83 seconds = 4.69 MB/sec Needless to say, I'm not too impressed since a P2-350 here at work w/UDMA IDE gets: /dev/hda: Timing buffer-cache reads: 64 MB in 0.68 seconds =94.12 MB/sec Timing buffered disk reads: 32 MB in 2.64 seconds =12.12 MB/sec But, I have some questions: 1. Am I correct in thinking that the buffer-cache reads result is really a measure of memory bandwidth? If so then the first number kind of makes sense. 2. Is this the kind of performance I should expect, or should I be getting better? -Jon Burchmore To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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