From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760771AbYBEUza (ORCPT ); Tue, 5 Feb 2008 15:55:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755392AbYBEUzX (ORCPT ); Tue, 5 Feb 2008 15:55:23 -0500 Received: from static-71-162-243-5.phlapa.fios.verizon.net ([71.162.243.5]:56894 "EHLO grelber.thyrsus.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755231AbYBEUzW (ORCPT ); Tue, 5 Feb 2008 15:55:22 -0500 From: Rob Landley Organization: Boundaries Unlimited To: linux-kernel@vger.kernel.org Subject: 2.6.24 says "serial8250: too much work for irq4" a lot. Date: Tue, 5 Feb 2008 14:55:10 -0600 User-Agent: KMail/1.9.6 (enterprise 0.20070907.709405) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200802051455.10831.rob@landley.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When running a 2.6.24 kernel built for x86-64 under qemu via serial console, doing CPU-intensive things that also produce a lot of output (such as compiling software) tends to produce the error message in the title. Anybody have a clue why? It doesn't seem to cause an actual problem, but it's kind of annoying. (If it's a qemu issue, I can go bother them. It's possible that qemu isn't delivering interrupts as often as it expects, since that's limited by the granularity of the host timer; I know the clock in qemu can run a bit slow because it only gets clock interrupts when the host system isn't too busy to schedule the emulator. But this doesn't usually cause a problem. I _think_ the message is just a "this should never happen" type warning, which is happening to me. But I break stuff. :) Rob -- "One of my most productive days was throwing away 1000 lines of code." - Ken Thompson.