From owner-freebsd-hackers Mon Jul 16 10:42:53 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from imo-r08.mx.aol.com (imo-r08.mx.aol.com [152.163.225.104]) by hub.freebsd.org (Postfix) with ESMTP id 7708637B421 for ; Mon, 16 Jul 2001 10:42:47 -0700 (PDT) (envelope-from Bsdguru@aol.com) Received: from Bsdguru@aol.com by imo-r08.mx.aol.com (mail_out_v31.7.) id n.3d.e7348af (3964) for ; Mon, 16 Jul 2001 13:42:39 -0400 (EDT) From: Bsdguru@aol.com Message-ID: <3d.e7348af.2884818f@aol.com> Date: Mon, 16 Jul 2001 13:42:39 EDT Subject: Re: NatSemi DP83820 gigE driver kit for 4.2 and 4.3 To: hackers@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: AOL 5.0 for Windows sub 139 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG In a message dated 07/16/2001 1:11:09 PM Eastern Daylight Time, tlambert2@mindspring.com writes: > > How do these perform compared to the more expensive gigabit cards? > > Read the driver. > > In general, they require an extra copy because of the inability > of the card to DMA on a reasonable boundry. > > Bill's commentary in his drivers is frequently enlightening, > and often amusing... 8-). > Maybe at some point he'll "get" that the boundry issue is a pci bus-mastering spec issue and not a controller design flaw, as he seems to harp on this in just about every driver? A more important question is "are these 32-bit cards, and if so, do they have enough internal buffer to do sustained 1GB transfers". Generally 32-bit PCI is too slow for GB, as it cant do sustained 1GB transfers. Some 32-bit GB cards are just a total waste. Bryan To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message