From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.slb.com (eurmta02.montrouge.eur.slb.com [163.187.152.23]) by ozlabs.org (Postfix) with ESMTP id 83ABF2BDA0 for ; Fri, 10 Dec 2004 03:00:32 +1100 (EST) Received: from pmxchannel-daemon.eurmta02.montrouge.eur.slb.com by eurmta02.montrouge.eur.slb.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) id <0I8G00F0DP1YE0@eurmta02.montrouge.eur.slb.com> for linuxppc-embedded@ozlabs.org; Thu, 09 Dec 2004 15:44:22 +0000 (GMT) Received: from wgmail3.oslo.eur.slb.com (wgmail3.oslo.eur.slb.com [134.32.44.153]) by eurmta02.montrouge.eur.slb.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTP id <0I8G001UWP1VM8@eurmta02.montrouge.eur.slb.com> for linuxppc-embedded@ozlabs.org; Thu, 09 Dec 2004 15:44:20 +0000 (GMT) Received: from OSL-1205-PC.westerngeco.com (localhost [127.0.0.1]) by wgmail3.oslo.eur.slb.com (Switch-2.2.8/8.11.1) with ESMTP id iB9FhXE22528 for ; Thu, 09 Dec 2004 16:43:33 +0100 (MET) Date: Thu, 09 Dec 2004 16:43:41 +0100 From: Jostein Pettersen To: linuxppc-embedded@ozlabs.org Message-id: <5.1.0.14.2.20041209153709.02cfa5f8@wgmail3.oslo.eur.slb.com> MIME-version: 1.0 Content-type: multipart/alternative; boundary="Boundary_(ID_9A1n6qV6SFgqMd/OFU4qiA)" Subject: Software routing in 8275 List-Id: Linux on Embedded PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --Boundary_(ID_9A1n6qV6SFgqMd/OFU4qiA) Content-type: text/plain; charset=us-ascii; format=flowed Content-transfer-encoding: 7BIT Hi, We consider using a MPC8275 running Embedded Linux to route two 100MB/s Ethernet links in software. The traffic will mostly be incoming on the two FE links and outgoing on the PCI bus, which is connected to a gigabit routing chip (can't connect the two FE links to the routing chip directly, since it only has GE ports). My question is: Will the MPC8275 be able to handle 2xFE full speed? Doing the calculations about bus speeds etc, it looks ok, but I know Linux does not like high interrupt rates. Is there a rule of thumb about what's the maximum recommended interrupt rate at a given clock speed? Hope to hear from you, Regards Jostein Pettersen --Boundary_(ID_9A1n6qV6SFgqMd/OFU4qiA) Content-type: text/html; charset=us-ascii Content-transfer-encoding: 7BIT Hi,

We consider using a MPC8275 running Embedded Linux to route two 100MB/s Ethernet links in software. The traffic will mostly be incoming on the two FE links and outgoing on the PCI bus, which is connected to a gigabit routing chip (can't connect the two FE links to the routing chip directly, since it only has GE ports).

My question is:
Will the MPC8275 be able to handle 2xFE full speed?

Doing the calculations about bus speeds etc, it looks ok, but I know Linux does not like high interrupt rates. Is there a rule of thumb about what's the maximum recommended interrupt rate at a given clock speed?

Hope to hear from you,
Regards
Jostein Pettersen

--Boundary_(ID_9A1n6qV6SFgqMd/OFU4qiA)--