From owner-freebsd-hackers Fri Sep 28 11:48:12 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from duke.cs.duke.edu (duke.cs.duke.edu [152.3.140.1]) by hub.freebsd.org (Postfix) with ESMTP id BCDFC37B410 for ; Fri, 28 Sep 2001 11:47:54 -0700 (PDT) Received: from grasshopper.cs.duke.edu (grasshopper.cs.duke.edu [152.3.145.30]) by duke.cs.duke.edu (8.9.3/8.9.3) with ESMTP id OAA19988; Fri, 28 Sep 2001 14:47:50 -0400 (EDT) Received: (from gallatin@localhost) by grasshopper.cs.duke.edu (8.11.3/8.9.1) id f8SIlOZ91144; Fri, 28 Sep 2001 14:47:24 -0400 (EDT) (envelope-from gallatin@cs.duke.edu) From: Andrew Gallatin MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <15284.50620.103948.237567@grasshopper.cs.duke.edu> Date: Fri, 28 Sep 2001 14:47:24 -0400 (EDT) To: "Louis A. Mamakos" Cc: hackers@FreeBSD.ORG Subject: Re: timestamp offload [was Re: TCP&IP cksum offload on FreeBSD 4.2] In-Reply-To: <200109281834.f8SIYdZ77174@whizzo.transsys.com> References: <200109270157.f8R1vZ546863@prism.flugsvamp.com> <3BB42E50.B32F5E95@mindspring.com> <15284.32914.874966.260722@grasshopper.cs.duke.edu> <200109281834.f8SIYdZ77174@whizzo.transsys.com> X-Mailer: VM 6.75 under 21.1 (patch 12) "Channel Islands" XEmacs Lucid 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 Louis A. Mamakos writes: > > Some work I did a year or so ago measured the interrupt response time > latency, and it was pretty impressive at how large and variable it > could be. > > louie Yes. Me too, but with a pamette, not a nic. Have you read the pci pamette perf paper (Systems Performance Measurement on PCI Pamette (1997), Laurent Moll & Mark Shand)? http://citeseer.nj.nec.com/1690.html If anybody cares, I have freebsd drivers for the pamette. Drew To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message