From owner-freebsd-questions Sun May 17 10:41:30 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id KAA16852 for freebsd-questions-outgoing; Sun, 17 May 1998 10:41:30 -0700 (PDT) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from alpo.whistle.com (alpo.whistle.com [207.76.204.38]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id KAA16770 for ; Sun, 17 May 1998 10:41:11 -0700 (PDT) (envelope-from julian@whistle.com) Received: (from daemon@localhost) by alpo.whistle.com (8.8.5/8.8.5) id KAA13874; Sun, 17 May 1998 10:39:01 -0700 (PDT) Received: from current1.whistle.com(207.76.205.22) via SMTP by alpo.whistle.com, id smtpd013869; Sun May 17 17:38:54 1998 Date: Sun, 17 May 1998 10:38:52 -0700 (PDT) From: Julian Elischer To: Jt cc: questions@FreeBSD.ORG Subject: Re: sio driver In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Sun, 17 May 1998, Jt wrote: > > Yeah I was trying for the 230000 I am isdn that was the whole > purpose of the 16650 to increase thoughput. > jkh mention that freebsd could handle 230 no problem just the 115000 > 16550 was the restriction. it runs in windows 95 fine on the 230000 > settings. If I where able to get no speed change I would stay at > 115000. Are you also isdn? > A you COULD fix it by recompiling the kernel with the HZ value set to 200 intead of 100. or you could do what we did which is to get a uart with 32 byte fifo's instead of 16. the trouble is that the serial devices are not REALLY interrupt driven, but run by the clock (it's a long story). 16 bytes at 230K is < 10mSec (the Hz ia 100Hz) julian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message