Date: Fri, 31 Mar 1995 16:12:44 -0800 From: "Justin T. Gibbs" <gibbs@estienne.CS.Berkeley.EDU> To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) Cc: freebsd-current@FreeBSD.org (FreeBSD-current users) Subject: Re: Floppy drive access overhead? Message-ID: <199504010012.QAA04851@estienne.cs.berkeley.edu> In-Reply-To: Your message of "Fri, 31 Mar 1995 23:07:36 %2B0200." <199503312107.XAA09495@uriah.heep.sax.de>
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>As Justin T. Gibbs wrote: >> >[formatting floppies] > >> . Under FreeBSD, I get "jerky" system >> behavior at best. Does anyone know why we have this problem >> and how it can be fixed? > >I can't confirm this. > >Adaptecs however (at least the old ones) are known to be broken. They >hog the bus for too long and cause the floppy driver to get DMA >overruns all the time when heavy SCSI activity is going on. The >floppy driver silently retries the failed transmissions, but it costs >allot of time (and is absolutely not optimized -- it simply waits a >whole revolution instead of trying other sectors first). Its a problem with msdosfs that David has a fix for. It was only happening when writing to msdos floppies. > >-- >cheers, J"org > >joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ >Never trust an operating system you don't have sources for. ;-) -- Justin T. Gibbs ============================================== TCS Instructional Group - Programmer/Analyst 1 Cory | Po | Danube | Volga | Parker | Torus ==============================================
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