From owner-freebsd-doc Tue Apr 13 9:27:14 1999 Delivered-To: freebsd-doc@freebsd.org Received: from alpha.airnet.net (unknown [216.180.30.97]) by hub.freebsd.org (Postfix) with ESMTP id B10DE159BA for ; Tue, 13 Apr 1999 09:27:07 -0700 (PDT) (envelope-from kris@airnet.net) Received: from airnet.net (216.180.35.96) by alpha.airnet.net (Worldmail 1.3.167) for freebsd-doc@FreeBSD.ORG; 13 Apr 1999 11:24:45 -0500 Message-ID: <37136FCC.5DA38381@airnet.net> Date: Tue, 13 Apr 1999 11:24:44 -0500 From: Kris Kirby Organization: Non Illegitemus Carborundum. X-Mailer: Mozilla 4.08 [en] (X11; I; FreeBSD 3.0-RELEASE i386) MIME-Version: 1.0 To: freebsd-doc@FreeBSD.ORG Subject: A Question for the FAQ... Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-doc@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org I had a chance to upgrade and immediately noticed that under certain circumstances, the UDMA option of the wd(4) driver can interfere with audio playback. Symptoms include: Audio chopping, slowing down, stopping. All occur under heavy to "normal" (normal for playing back a 44100 Hz, 16 bit, stereo .WAV file) disk access. Turning off the DMA (flags 0x2000) results in a return to normalcy, without any loss in performance. (I bonnie'd the hard drive like crazy to make sure :-). Machine: AMD K6-2, 300 MHz. Spacewalker HOT-591P "Super 7" MB, 512K L2. RAM: 64MB of PC100, running at 66 MHz (Processor is 66 MHz version) Hard drive: 6.8G Maxtor DiamondMax (Maxtor 90680D4) Audio Card: Yamaha YMH0020, using Luigi's driver. Any other questions necessary, email me. I have fixed the problem at the point in time. It just seemed like a really good one for the FAQ to cover. -- Kris Kirby Home UAH CS WWW ------------------------------------------- TGIFreeBSD... 'Nuff said. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-doc" in the body of the message