From owner-freebsd-hackers Fri Jul 11 01:11:14 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id BAA25109 for hackers-outgoing; Fri, 11 Jul 1997 01:11:14 -0700 (PDT) Received: from genesis.atrad.adelaide.edu.au (genesis.atrad.adelaide.edu.au [129.127.96.120]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id BAA25100 for ; Fri, 11 Jul 1997 01:11:05 -0700 (PDT) Received: (from msmith@localhost) by genesis.atrad.adelaide.edu.au (8.8.5/8.7.3) id RAA23301; Fri, 11 Jul 1997 17:40:51 +0930 (CST) From: Michael Smith Message-Id: <199707110810.RAA23301@genesis.atrad.adelaide.edu.au> Subject: Re: Trigger for received PPP packets? In-Reply-To: <199707110347.NAA32223@godzilla.zeta.org.au> from Bruce Evans at "Jul 11, 97 01:47:08 pm" To: bde@zeta.org.au (Bruce Evans) Date: Fri, 11 Jul 1997 17:40:50 +0930 (CST) Cc: hackers@FreeBSD.ORG, mcgovern@spoon.beta.com X-Mailer: ELM [version 2.4ME+ PL28 (25)] 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 Bruce Evans stands accused of saying: > > >that I'm seeing is that a received packet is taking quite a long time > >(roughly 100 - 150ms) to get processed. A ping, for instance, on a 115200 > >serial link, takes about 347-380ms round trip. > > Apparently the driver is not delivering characters to ppp promptly. I > guess it uses huge buffers and doesn't get interrupted for packet framing > characters. Just to clarify for Brian; this is what the 'hotchar' stuff in the sio driver is all about. -- ]] Mike Smith, Software Engineer msmith@gsoft.com.au [[ ]] Genesis Software genesis@gsoft.com.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control. (ph) +61-8-8267-3493 [[ ]] Unix hardware collector. "Where are your PEZ?" The Tick [[