From owner-freebsd-current Mon May 18 09:47:02 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA11223 for freebsd-current-outgoing; Mon, 18 May 1998 09:47:02 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from labinfo.iet.unipi.it (labinfo.iet.unipi.it [131.114.9.5]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id JAA11216 for ; Mon, 18 May 1998 09:46:57 -0700 (PDT) (envelope-from luigi@labinfo.iet.unipi.it) Received: from localhost (luigi@localhost) by labinfo.iet.unipi.it (8.6.5/8.6.5) id RAA07289; Mon, 18 May 1998 17:02:45 +0200 From: Luigi Rizzo Message-Id: <199805181502.RAA07289@labinfo.iet.unipi.it> Subject: Re: ATAPI CDDA Extraction under FreeBSD To: hasty@rah.star-gate.com (Amancio Hasty) Date: Mon, 18 May 1998 17:02:44 +0200 (MET DST) Cc: regnauld@deepo.prosa.dk, current@FreeBSD.ORG In-Reply-To: <199805181636.JAA04038@rah.star-gate.com> from "Amancio Hasty" at May 18, 98 09:35:44 am X-Mailer: ELM [version 2.4 PL23] Content-Type: text Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > How many outstanding dma requests can the IDE bus handle? we are doing programmed i/o at least on 2.2.X > For instance do you expect to be able to read audio CDs while > doing heavy i/o on the IDE disks? I have no idea if there is any fairness policy in handling multiple peripherals on the IDE bus (is there one for SCSI peripherals, BTW ?) I am asking because at least for accessing files on the same disk it is quite easy for a process (even a non privileged one i'd say) to completely starve others. cheers kyufu (which is luigi typed one position to the left... ) -----------------------------+-------------------------------------- Luigi Rizzo | Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it | Universita' di Pisa tel: +39-50-568533 | via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 | http://www.iet.unipi.it/~luigi/ _____________________________|______________________________________ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message