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Newsgroups: comp.os.386bsd.development Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!elroy.jpl.nasa.gov!decwrl!netcomsv!netcom.com!jmonroy From: jmonroy@netcom.com (Jesus Monroy Jr) Subject: Re: [FreeBSD 1.0R] DMA Problems? Message-ID: <jmonroyCI6HqF.Hxu@netcom.com> Organization: NETCOM On-line Communication Services (408 241-9760 guest) X-Newsreader: TIN [version 1.1 PL8] References: <2eopau$hde@vixen.cso.uiuc.edu> Date: Fri, 17 Dec 1993 12:08:39 GMT Lines: 31 Rafal Boni (rkb55989@uxa.cso.uiuc.edu) wrote: : j@uriah.sax.de (J Wunsch) writes: : [stuff J"org and Terry were debating deleted...] : >In fact, i'm also experiencing lotta DMA overruns when attempting to do : >some floppy IO while some heavy compile job is running. This is in a box : >with an Adaptec SCSI, and i didn't track it down whether it's the CPU : >load that causes the trouble (would really look strange to me), or if : >it's the heavy disk IO that happens while compiling. : I would be tempted to say that the Adaptec is at fault... I have a : 3Com 3c507 Ethernet card in my machine, and the docs SPECIFICALLY : mention the fact that Adaptec's 154x may cause problems for the : Ethernet card's DMA reads/writes.... Later 3Com updated some of : the [I would guess] DMA related circuitry to be able to handle longer : timeouts or something of that nature... : Most problems encountered with Adaptec's 154X and ethernet cards are I/O port, IRQ and DMA channel conflicts. Both 3Com cards and Adaptec's card are configurable to many setting. Getting them to conflict is very easy. I would not be so quick to blame the AHA card. -- Jesus Monroy Jr jmonroy@netcom.com Zebra Research /386BSD/device-drivers /fd /qic /clock /documentation ___________________________________________________________________________