From owner-freebsd-hackers Wed Oct 27 1:34:45 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from web1402.mail.yahoo.com (web1402.mail.yahoo.com [128.11.23.166]) by hub.freebsd.org (Postfix) with SMTP id D0EDE14FAF for ; Wed, 27 Oct 1999 01:34:42 -0700 (PDT) (envelope-from etdebruin@yahoo.com) Message-ID: <19991027083557.22017.rocketmail@web1402.mail.yahoo.com> Received: from [194.245.91.1] by web1402.mail.yahoo.com; Wed, 27 Oct 1999 01:35:57 PDT Date: Wed, 27 Oct 1999 01:35:57 -0700 (PDT) From: =?iso-8859-1?q?eT?= Reply-To: eT@post.com Subject: PCI bus Latency To: hackers@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Greetings .. When doing a pci_read_config(dev, PCI_LATENCY_TIMER, 4) I get varying values on different hardware configurations. On Machine A the value is 32 and my device driver (using DMA) works fine. On Machine B the value is 64 and my device driver doesn't work fine - there seem s to be these hickups in which the Chip writing to the PCI controller says it ha s finished transferring data but the write counters are still > 0. My card works closely with two network cards in the system. Actually, I reckon I just need some pointers and things to remember when it come s to dealing with latency. Any help? Regards eT ===== Etienne de Bruin http://www.geocities.com/etdebruin __________________________________________________ Do You Yahoo!? Bid and sell for free at http://auctions.yahoo.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message