Date: Sat, 04 Mar 1995 19:18:07 -0800 From: "Justin T. Gibbs" <gibbs@estienne.CS.Berkeley.EDU> To: Steven G Kargl <kargl@troutmask.apl.washington.edu> Cc: freebsd-current@freefall.cdrom.com (FreeBSD Current) Subject: Re: poor SCSI disk performance Message-ID: <199503050318.TAA08204@estienne.cs.berkeley.edu> In-Reply-To: Your message of "Sat, 04 Mar 1995 17:52:33 PST." <199503050152.RAA00135@troutmask.apl.washington.edu>
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>Sources supped on 950303 at 1700 PST. I did a make world, and >supped /sys today 950304 at 1645 PST to rebuild the kernel. >So, I have the recently revamped SCSI stuff in my system. The >system is 486DX66, Adaptec 1742, Maxtor mxt-540-s. `Iozone 16' >reports roughly 850KB/s write and 1MB/s read. I looked into >using tunefs to improve performance, but nothing I tried seemed >to give better results. I should also point out the system >fragmentation is below 3%. > >With the exact hardware and FBSD 1.1.5.1, I was getting numbers >around 1.5 to 2MB/s write and 3MB/s read. I still get 5MB/s going to an Empire 2100 from my 2742 under current. I don't think that Peter's changes are affecting your results. There are other bugs in current's VM system that are probably causing your performance problems. > >-- >Steven G. Kargl | Phone: 206-685-4677 | >Applied Physics Laboratory | Fax: 206-543-6785 | >University of Washington |---------------------| >1013 NE 40th St | FreeBSD 2.1-current | >Seattle, WA 98105 |---------------------| -- Justin T. Gibbs ============================================== TCS Instructional Group - Programmer/Analyst 1 Cory | Po | Danube | Volga | Parker | Torus ==============================================
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