From owner-freebsd-hackers Sun Sep 2 12:52:40 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from wall.polstra.com (rtrwan160.accessone.com [206.213.115.74]) by hub.freebsd.org (Postfix) with ESMTP id F0D2237B401 for ; Sun, 2 Sep 2001 12:52:35 -0700 (PDT) Received: from vashon.polstra.com (vashon.polstra.com [206.213.73.13]) by wall.polstra.com (8.11.3/8.11.3) with ESMTP id f82JqXg18622; Sun, 2 Sep 2001 12:52:33 -0700 (PDT) (envelope-from jdp@wall.polstra.com) Received: (from jdp@localhost) by vashon.polstra.com (8.11.6/8.11.0) id f82JqWa02677; Sun, 2 Sep 2001 12:52:32 -0700 (PDT) (envelope-from jdp) Date: Sun, 2 Sep 2001 12:52:32 -0700 (PDT) Message-Id: <200109021952.f82JqWa02677@vashon.polstra.com> To: hackers@freebsd.org From: John Polstra Cc: "Deepak Jain" Subject: Re: Routing Performance? In-Reply-To: <200109021906.f82J6eh02459@vashon.polstra.com> References: <200109021906.f82J6eh02459@vashon.polstra.com> Organization: Polstra & Co., Seattle, WA 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 Correcting myself ... In article <200109021906.f82J6eh02459@vashon.polstra.com>, John Polstra wrote: > There is very little bulk copying in the IP forwarding path of the > kernel, so the higher bandwidth of RAMBUS would not provide much > benefit. I suppose it would speed up the DMA transfers between the > NICs and RAM. Actually, it wouldn't help the DMA transfers either. They'd be limited by the PCI bus bandwidth, not the memory bandwidth. John -- John Polstra jdp@polstra.com John D. Polstra & Co., Inc. Seattle, Washington USA "Disappointment is a good sign of basic intelligence." -- Chögyam Trungpa To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message