Date: Sat, 2 Mar 1996 11:36:08 +1030 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: nate@sri.MT.net (Nate Williams) Cc: tomppa@fidata.fi, questions@freebsd.org Subject: Re: Backup problem Message-ID: <199603020106.LAA04099@genesis.atrad.adelaide.edu.au> In-Reply-To: <199602292321.QAA13183@rocky.sri.MT.net> from "Nate Williams" at Feb 29, 96 04:21:38 pm
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Nate Williams stands accused of saying: > > > My system hangs when I'm doing full backup to DAT drive with tar or > > cpio. > ... > > it takes 5-55 minutes before it happens. > .... > > > I changed bt driver to aha (AMI SCSI controller is compatible with > > buslogic 742a and Adaptec 1542). With aha driver backupping works like > > a charm. Making full backup taked over an hour but it worked > > smoothly. I even tried it twice. Any good explanations? > > Yep, I'll bet the bounce buffer code is enabled on the aha driver and > might not be on the buslogic. > > > > real memory = 33554432 (32768K bytes) > > This is important if you have more than 16MB and your card can't do DMA > above 16MB. > > > > bt0: Bt747S/ 0-(32bit) bus > > The bt driver assumes it can. ... and what hasn't been mentioned is that quite a number of EISA motherboards (the 747 is an EISA board, right?) don't handle DMA above the 16M mark properly (or at all). > Nate -- ]] 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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