From owner-freebsd-current Wed Mar 4 18:52:40 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id SAA03448 for freebsd-current-outgoing; Wed, 4 Mar 1998 18:52:40 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from sendero.simon-shapiro.org (sendero-fxp0.Simon-Shapiro.ORG [206.190.148.34]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id SAA03403 for ; Wed, 4 Mar 1998 18:52:17 -0800 (PST) (envelope-from shimon@sendero-fxp0.simon-shapiro.org) Received: (qmail 17351 invoked by uid 1000); 5 Mar 1998 02:58:44 -0000 Message-ID: X-Mailer: XFMail 1.3-alpha-021598 [p0] on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: <053601bd47dd$6cedf300$c9252fce@cello.synapse.net> Date: Wed, 04 Mar 1998 18:58:44 -0800 (PST) Reply-To: shimon@simon-shapiro.org Organization: The Simon Shapiro Foundation From: Simon Shapiro To: Evan Champion Subject: Re: silo overflows (Was Re: 3.0-RELEASE?) Cc: current@FreeBSD.ORG, Mike Smith , Matthew Thyer Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On 05-Mar-98 Evan Champion wrote: >>This happens a lot as after several hours (2 or 3) of using >>ijppp and XFree86 the count of FIFO overflows can be around 100. > > > I have a Pentium Pro 200 with 16650's (and the 16650's are detected) and > during a full install of FreeBSD over 128kbps ISDN (230.4kbps port speed) > I > would get around 700 FIFO overflows. Someone would have to do a lot of > convincing to get me to believe the driver is working properly when a > machine like that can't handle a 128kbps datastream in single user > mode... Assume you are doing something like FTP of packages-current. You are reading about 16 kilobytes per second, which is just about 1,142 interrupts per second (assuming a 16 myte FIFO and 14 byte treshold. Every 1KB, you write to disk, so now we have 1,160 interrupts per second. Add 10% ACK on the FTP connection, HZ heartbeat, and you have 1,400 interrupts per second. Say 2,000 interrupts/Sec. A P6-200 will be safe in this regard. In a RT O/S this will give us about 500us per interrupt. What do you think? ---------- Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG Voice: 503.799.2313 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message