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Newsgroups: comp.unix.bsd Path: sserve!manuel!munnari.oz.au!uunet!destroyer!sol.ctr.columbia.edu!news.unomaha.edu!cwis!jsaker From: jsaker@cwis.unomaha.edu (James R. Saker Jr.) Subject: Re: 386BSD QIC-02 Driver with Wangtek 5150PK is sloooooow Message-ID: <jsaker.714361130@cwis> Sender: news@news.unomaha.edu (UNO Network News Server) Organization: University of Nebraska at Omaha References: <1992Aug17.191318.8853@hotb.sub.org> <1992Aug19.051745.16119@zip.eecs.umich.edu> Date: Fri, 21 Aug 1992 01:38:50 GMT Lines: 42 dmuntz@dip.eecs.umich.edu (Daniel A Muntz) writes: >The problem isn't the 512-byte blocks, per se, but that the controller doesn't >receive data quickly enough to allow the drive to stream properly. You can >get some performance improvement by buffering data in the driver and polling >the controller instead of waiting for interrupts and timeouts. Perhaps >someone could comment on why so many interrupts seem to get lost. I've >hacked wt.c to do buffering and polling to make the qic-02 drives usable, but >this isn't really the "right" solution. A couple of thoughts: Would this explain why my tar -cvf /dev/rwt0 to my Wangtek QIC-150 drive produces unusual "features", including: o wildcard tarring writes only one file from each sequence, for example, tar -cvf /dev/rwt0 etc* with files etc01 to etc09, etc10 to etc19, etc20 to etc29 results in one file from etc0*, one file from etc1*, etc. (i.e. etc04, etc18, etc21, etc33 being the only ones written) o tarring large files (esp. large tar.Z files) results in an end of tape not found error o accessing floppies during tar operation results in errors in the floppy operation Tar has no problem reading from the unit - even sizable files written from another system to tape. And the files it does write to tape are reliable and hold their integrity. Any ideas/suggestions? While I'm on the podium, how about plans for EISA support eventually?;-) > -Dan .. . . . . . . . . . . . . . . . . . . . . . . . . . .. Jamie Saker jsaker@cwis.unomaha.edu . .. Network Costing Analyst Business/MIS Major . .. Telenational Communications Univ. Nebraska at Omaha . .. (402) 392-7548 . .. . . . . . . . . . . . . . . . . . . . . . . . . .