From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754439AbYGXJcY (ORCPT ); Thu, 24 Jul 2008 05:32:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751433AbYGXJcL (ORCPT ); Thu, 24 Jul 2008 05:32:11 -0400 Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:52669 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751309AbYGXJcK (ORCPT ); Thu, 24 Jul 2008 05:32:10 -0400 Date: Thu, 24 Jul 2008 02:32:10 -0700 (PDT) Message-Id: <20080724.023210.229338550.davem@davemloft.net> To: peterz@infradead.org Cc: jarkao2@gmail.com, Larry.Finger@lwfinger.net, kaber@trash.net, torvalds@linux-foundation.org, akpm@linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, mingo@redhat.com, nickpiggin@yahoo.com.au, paulmck@linux.vnet.ibm.com Subject: Re: Kernel WARNING: at net/core/dev.c:1330 __netif_schedule+0x2c/0x98() From: David Miller In-Reply-To: <1216891625.7257.261.camel@twins> References: <1216890648.7257.258.camel@twins> <20080724.022040.23129457.davem@davemloft.net> <1216891625.7257.261.camel@twins> X-Mailer: Mew version 5.2 on Emacs 22.1 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peter Zijlstra Date: Thu, 24 Jul 2008 11:27:05 +0200 > Well, not only lockdep, taking a very large number of locks is expensive > as well. Right now it would be on the order of 16 or 32 for real hardware. Much less than the scheduler currently takes on some of my systems, so currently you are the pot calling the kettle black. :-) USHORT_MAX is just the upper hard limit imposed by the software interface merely as a side effect of storing the queue number of the SKB as a u16.