From owner-freebsd-questions@FreeBSD.ORG Sat Oct 15 15:30:50 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 882AE16A41F for ; Sat, 15 Oct 2005 15:30:50 +0000 (GMT) (envelope-from scode@starfury.scode.org) Received: from starfury.scode.org (starfury.scode.org [194.145.249.108]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1D35543D49 for ; Sat, 15 Oct 2005 15:30:50 +0000 (GMT) (envelope-from scode@starfury.scode.org) Received: by starfury.scode.org (Postfix, from userid 1001) id 6E1C49A8867; Sat, 15 Oct 2005 17:30:47 +0200 (CEST) Date: Sat, 15 Oct 2005 17:30:47 +0200 From: Peter Schuller To: freebsd-questions@freebsd.org Message-ID: <20051015153046.GA43455@starfury.scode.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.11 Subject: 3c905C: very high system/interrupt CPU usage X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 15 Oct 2005 15:30:50 -0000 Hello, I have a machine here with a couple of 3c905C:s in it. For some reason, network activity causes very high amounts of system and interrupt CPU usage. By "very high" i mean more than 50% interrupt, and more than 25% system usage. It is not just a measuring issue either, because the whole reason I looked into it was that file transfers have been slow for as long as I can remember. Especially with ssh, everything is extremely slow given that only a small fraction of the available CPU resources are left over for userspace. Any ideas on what would cause this? I am not experiencing any other issues with the NIC or anything else, its just the high CPU usage. Could it be that the xl driver has fallen back to not using DMA (is that even supported with 3c905c?)? If this is the case, is there a way to find out whether it is currently using DMA? (I see nothing in particular in the kernel log). Also: The CPU usage problem occurrs on both outgoing and incoming traffic, and on both NIC:s. -- / Peter Schuller, InfiDyne Technologies HB PGP userID: 0xE9758B7D or 'Peter Schuller ' Key retrieval: Send an E-Mail to getpgpkey@scode.org E-Mail: peter.schuller@infidyne.com Web: http://www.scode.org