From owner-freebsd-hackers Wed Jun 7 14:56:50 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id OAA19422 for hackers-outgoing; Wed, 7 Jun 1995 14:56:50 -0700 Received: from irz301.inf.tu-dresden.de (irz301.inf.tu-dresden.de [141.76.1.11]) by freefall.cdrom.com (8.6.10/8.6.6) with SMTP id OAA19412 for ; Wed, 7 Jun 1995 14:56:47 -0700 Received: from sax.sax.de by irz301.inf.tu-dresden.de with SMTP (5.67b+/DEC-Ultrix/4.3) id AA21271; Wed, 7 Jun 1995 23:56:45 +0200 Received: by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id XAA03636; Wed, 7 Jun 1995 23:56:44 +0200 Received: (from j@localhost) by uriah.heep.sax.de (8.6.11/8.6.9) id XAA12270; Wed, 7 Jun 1995 23:31:45 +0200 From: J Wunsch Message-Id: <199506072131.XAA12270@uriah.heep.sax.de> Subject: Re: silo overflows To: jleppek@suw2k.ess.harris.com (James Leppek) Date: Wed, 7 Jun 1995 23:31:45 +0200 (MET DST) Cc: freebsd-hackers@freefall.cdrom.com In-Reply-To: <9506071209.AA20749@borg.ess.harris.com> from "James Leppek" at Jun 7, 95 08:09:08 am Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) X-Phone: +49-351-2012 669 X-Mailer: ELM [version 2.4 PL23] Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Content-Length: 618 Sender: hackers-owner@FreeBSD.org Precedence: bulk As James Leppek wrote: > > The only bus hogging DMA I could think of is the 1542CF but it is > at the default settings which I thought were safe. Adaptec's 154X controllers are the most `famous' bus hogs. They do also cause all sort of troubles with floppy DMA operations (even though the FDC DMA overrun conditions are hidden from the user, but you will notice a _drastical_ floppy throughput drop when doing simultaneous operations on an AHA-154X controlled SCSI bus). -- 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. ;-)