From owner-cvs-all  Thu Feb  4 05:45:16 1999
Return-Path: <owner-cvs-all@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id FAA16646
          for cvs-all-outgoing; Thu, 4 Feb 1999 05:45:16 -0800 (PST)
          (envelope-from owner-cvs-all@FreeBSD.ORG)
Received: from freefall.freebsd.org (freefall.FreeBSD.ORG [204.216.27.21])
          by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id FAA16634;
          Thu, 4 Feb 1999 05:45:15 -0800 (PST)
          (envelope-from bde@FreeBSD.org)
From: Bruce Evans <bde@FreeBSD.ORG>
Received: (from bde@localhost)
	by freefall.freebsd.org (8.9.2/8.9.2) id FAA38267;
	Thu, 4 Feb 1999 05:45:14 -0800 (PST)
	(envelope-from bde@FreeBSD.org)
Date: Thu, 4 Feb 1999 05:45:14 -0800 (PST)
Message-Id: <199902041345.FAA38267@freefall.freebsd.org>
To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
Subject: cvs commit: src/sys/i386/isa sio.c
Sender: owner-cvs-all@FreeBSD.ORG
Precedence: bulk

bde         1999/02/04 05:45:14 PST

  Modified files:
    sys/i386/isa         sio.c 
  Log:
  Set up interrupt-level input buffering dynamically depending on
  the input speed, so that it can work at speeds larger than 115200
  bps without being flow controlled.  The buffer is twice as large
  as before at 115200 bps and half as large as before at low speeds
  Use a single interrupt-level buffer instead of ping-pong buffers
  because the simplifications provided by ping-pong buffers became
  complications.
  
  This change is over-engineered.  Statically configured buffering
  was simpler and faster, and increasing the buffer size to support
  1.5Mbps would cost about 1 US cent's worth of RAM per port, but I
  was interested in the buffer switching mechanism.
  
  Revision  Changes    Path
  1.227     +177 -111  src/sys/i386/isa/sio.c

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe cvs-all" in the body of the message