Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261262AbUC3Vay (ORCPT ); Tue, 30 Mar 2004 16:30:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261351AbUC3Vay (ORCPT ); Tue, 30 Mar 2004 16:30:54 -0500 Received: from mx1.redhat.com ([66.187.233.31]:26051 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S261262AbUC3Vav (ORCPT ); Tue, 30 Mar 2004 16:30:51 -0500 Date: Tue, 30 Mar 2004 13:30:00 -0800 From: "David S. Miller" To: Andrea Arcangeli Cc: kuznet@ms2.inr.ac.ru, dipankar@in.ibm.com, linux-kernel@vger.kernel.org, netdev@oss.sgi.com, Robert.Olsson@data.slu.se, paulmck@us.ibm.com, akpm@osdl.org Subject: Re: route cache DoS testing and softirqs Message-Id: <20040330133000.098761e2.davem@redhat.com> In-Reply-To: <20040330211450.GI3808@dualathlon.random> References: <20040329222926.GF3808@dualathlon.random> <200403302005.AAA00466@yakov.inr.ac.ru> <20040330211450.GI3808@dualathlon.random> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; sparc-unknown-linux-gnu) X-Face: "_;p5u5aPsO,_Vsx"^v-pEq09'CU4&Dc1$fQExov$62l60cgCc%FnIwD=.UF^a>?5'9Kn[;433QFVV9M..2eN.@4ZWPGbdi<=?[:T>y?SD(R*-3It"Vj:)"dP Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 694 Lines: 18 On Tue, 30 Mar 2004 23:14:50 +0200 Andrea Arcangeli wrote: > > There are no hardirqs in the case under investigation, remember? > > no hardirqs? there must be tons of hardirqs if ksoftirqd never runs. NAPI should be kicking in for this workload, and I know for a fact it is for Robert's case. There should only be a few thousand hard irqs per second. Until the RX ring is depleted the device's hardirqs will not be re- enabled. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/