From owner-freebsd-current Wed Jun 2 12:13:58 1999 Delivered-To: freebsd-current@freebsd.org Received: from khavrinen.lcs.mit.edu (khavrinen.lcs.mit.edu [18.24.4.193]) by hub.freebsd.org (Postfix) with ESMTP id A284D1551D for ; Wed, 2 Jun 1999 12:13:44 -0700 (PDT) (envelope-from wollman@khavrinen.lcs.mit.edu) Received: (from wollman@localhost) by khavrinen.lcs.mit.edu (8.9.1/8.9.1) id PAA24696; Wed, 2 Jun 1999 15:13:27 -0400 (EDT) (envelope-from wollman) Date: Wed, 2 Jun 1999 15:13:27 -0400 (EDT) From: Garrett Wollman Message-Id: <199906021913.PAA24696@khavrinen.lcs.mit.edu> To: Bruce Evans Cc: dfr@nlsystems.com, wollman@khavrinen.lcs.mit.edu, current@FreeBSD.ORG, newton@atdot.dotat.org Subject: Re: IRQ sharing with newbus In-Reply-To: <199906020617.QAA17171@godzilla.zeta.org.au> References: <199906020617.QAA17171@godzilla.zeta.org.au> Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG < said: >> But the sio non-multiport stuff should be able to use RF_TIMESHARE. -- >> If I'm not using my serial port, I should be able to use my >> infrared.... > Preemptive timesharing would be hard to implement reasonably for irqs. > A uniform timeslice would have to be 86 usec to work properly for > unbuffered sio devices at 115200 bps. You're talking intervals about six orders of magnitude smaller than I am. -GAWollman -- Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same wollman@lcs.mit.edu | O Siem / The fires of freedom Opinions not those of| Dance in the burning flame MIT, LCS, CRS, or NSA| - Susan Aglukark and Chad Irschick To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message