From owner-freebsd-hardware Sat Jun 29 10:07:27 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id KAA14838 for hardware-outgoing; Sat, 29 Jun 1996 10:07:27 -0700 (PDT) Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id KAA14831 for ; Sat, 29 Jun 1996 10:07:22 -0700 (PDT) Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.12/8.6.9) id DAA11614; Sun, 30 Jun 1996 03:05:52 +1000 Date: Sun, 30 Jun 1996 03:05:52 +1000 From: Bruce Evans Message-Id: <199606291705.DAA11614@godzilla.zeta.org.au> To: bde@zeta.org.au, msmith@atrad.adelaide.edu.au Subject: Re: muliport boards - building a PPP dialup server Cc: Kevin_Swanson@BLaCKSMITH.com, bsdi-users@bsdi.com, hardware@FreeBSD.org, jparnas@jparnas.cybercom.net, stesin@elvisti.kiev.ua Sender: owner-hardware@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk >It wouldn't surprise me for some other part of the system to block >serial interrupts for 1/2msec or longer; FIFO overflows on a 16550 occur >on occasion on an X workstation running at 38k4, ie. 4ms worth of FIFO. >Hence the comment about a dedicated system. That's a bug in the other part of the system (probably the X server or the graphics card). There are no known bugs in this area in the kernel software since I fixed everything that blocked serial interrupts for more than a few microseconds before I worked on the serial driver. The maximum latency is about 10 usec on a 486/33. Bruce