From owner-freebsd-hackers Wed Aug 14 08:27:31 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id IAA05542 for hackers-outgoing; Wed, 14 Aug 1996 08:27:31 -0700 (PDT) Received: from THOR.INNOSOFT.COM (THOR.INNOSOFT.COM [192.160.253.66]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id IAA05537 for ; Wed, 14 Aug 1996 08:27:29 -0700 (PDT) Received: from INNOSOFT.COM by INNOSOFT.COM (PMDF V5.0-7 #8694) id <01I89COB184G8Y4ZFL@INNOSOFT.COM>; Wed, 14 Aug 1996 08:26:21 -0700 (PDT) Date: Wed, 14 Aug 1996 08:26:21 -0700 (PDT) From: zounds@INNOSOFT.COM Subject: Re: sio issues (silo overflows on a pentium, locked in ttywait, etc...) In-reply-to: <199608140213.TAA27489@freefall.freebsd.org> To: Craig Harding Cc: freebsd-hackers@FreeBSD.org Message-id: MIME-version: 1.0 Content-type: TEXT/PLAIN; charset=US-ASCII Content-transfer-encoding: 7BIT Sender: owner-hackers@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk On Wed, 14 Aug 1996, Craig Harding wrote: > Thomas David Rivers writes: > > >Seems to me a Pentium 75 should be able to keep up with 19200, and > >hopefully be able to do much better... am I the only one tripping > >over these sio issues? Is there some other magic to setting rts/cts > >that I don't know about? Is there any hope my 386dx with 16550As will > >be able to handle anything higher than 19200 without locking up? > > As a data point: I'm running 2.0.5-RELEASE on a 486SX25 with two serial > ports containing real 16550As. Both ports are locked at 57600 and users > happily dialin and use one line interactively (on a 14k4 modem) while the > other line on the 28k8 modem gets 3400cps receiving approx. 80MB of > compressed news per day via Taylor UUCP. No silo overflows. > > I think the previous message relating to custom single-chip emulation of a > 16550A may explain your problems. > I am wondering if the 19200 speed is because of the lack of hardware handshaking cables.