From owner-freebsd-current Fri Mar 31 16:21:12 1995 Return-Path: current-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id QAA11938 for current-outgoing; Fri, 31 Mar 1995 16:21:12 -0800 Received: from estienne.cs.berkeley.edu (estienne.CS.Berkeley.EDU [128.32.42.147]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id QAA11932 for ; Fri, 31 Mar 1995 16:21:11 -0800 Received: from localhost (localhost [127.0.0.1]) by estienne.cs.berkeley.edu (8.6.9/8.6.9) with SMTP id QAA04851; Fri, 31 Mar 1995 16:12:44 -0800 Message-Id: <199504010012.QAA04851@estienne.cs.berkeley.edu> X-Authentication-Warning: estienne.cs.berkeley.edu: Host localhost didn't use HELO protocol To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) cc: freebsd-current@FreeBSD.org (FreeBSD-current users) Subject: Re: Floppy drive access overhead? In-reply-to: Your message of "Fri, 31 Mar 1995 23:07:36 +0200." <199503312107.XAA09495@uriah.heep.sax.de> Date: Fri, 31 Mar 1995 16:12:44 -0800 From: "Justin T. Gibbs" Sender: current-owner@FreeBSD.org Precedence: bulk >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 ==============================================