Date: Thu, 2 Jan 1997 00:09:40 +0100 From: andreas@klemm.gtn.com (Andreas Klemm) To: jfieber@indiana.edu (John Fieber) Cc: hackers@FreeBSD.org Subject: Re: New motherboard breaks tape drive Message-ID: <Mutt.19970102000940.andreas@klemm.gtn.com> In-Reply-To: <Pine.BSI.3.95.961231135104.353A-100000@fallout.campusview.indiana.edu>; from "John Fieber" on Dec 31, 1996 14:02:35 -0500 References: <Pine.BSI.3.95.961231135104.353A-100000@fallout.campusview.indiana.edu>
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John Fieber writes: > I have an Archive Viper 150 tape drive that has served me well > for many years. I have never had difficulty getting the maximum > performance of about 100K/second writing speed from it... > > ...until upgrade my old 486DX33 motherboard to a Pentium 100 > (ASUS). Now the tape drive will no longer stream and typical > writing speed has dropped to about 50K/second. > > My first thought was something with the new SCSI controller (ASUS > SC200) was the problem so I put my old Adaptec 1542C in, but the > result was the same (I even tried putting the drive alone on the > bus). I tried team, but it didn't help. > > I'm fishing for where to look next. Ideas? Did you upgrade only the board or did you additionally a - FreeBSD release change - FreeBSD kernel recompile How is your kernel config file. What's the SC200 ? PCI controller ? AHA 2940 compatible or what ? I get about 300-600 KB/sec throughput using dump and a TDC 4222, which uses data compression. I'm getting these numbers with -current and 2.2-Release (Beta of today). BTW: My numbers depend heavily on filesystem fragmentation. BTW, did you try team from the ports collection ? team(1) - parallel pipe, allows asynchronous io This can be used to speedup data throughput for tar and dump and friends ;-) Andreas /// -- andreas@klemm.gtn.com /\/\___ Wiechers & Partner Datentechnik GmbH Andreas Klemm ___/\/\/ Support Unix -- andreas.klemm@wup.de pgp p-key http://www-swiss.ai.mit.edu/~bal/pks-toplev.html >>> powered by <<< ftp://sunsite.unc.edu/pub/Linux/system/Printing/aps-491.tgz >>> FreeBSD <<<
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