From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934459AbYBGUOa (ORCPT ); Thu, 7 Feb 2008 15:14:30 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757347AbYBGUNv (ORCPT ); Thu, 7 Feb 2008 15:13:51 -0500 Received: from static-71-162-243-5.phlapa.fios.verizon.net ([71.162.243.5]:50890 "EHLO grelber.thyrsus.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1756851AbYBGUNt (ORCPT ); Thu, 7 Feb 2008 15:13:49 -0500 From: Rob Landley Organization: Boundaries Unlimited To: "H. Peter Anvin" Subject: Re: 2.6.24 says "serial8250: too much work for irq4" a lot. Date: Thu, 7 Feb 2008 14:13:44 -0600 User-Agent: KMail/1.9.6 (enterprise 0.20070907.709405) Cc: Ingo Molnar , linux-kernel@vger.kernel.org References: <200802051455.10831.rob@landley.net> <20080207123937.GC15647@elte.hu> <47AB41C8.3010001@zytor.com> In-Reply-To: <47AB41C8.3010001@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200802071413.45085.rob@landley.net> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thursday 07 February 2008 11:37:12 H. Peter Anvin wrote: > > actually, the way i solved it for qemu+KVM+paravirt was to just turn off > > this rather silly check in the serial driver if inside a paravirt guest. > > When we are emulated then the serial 'hardware' is totally reliable and > > we should just trust it. That way i never dropped a single bit of kernel > > log output again. > > Yes, but keying that on paravirt is silly in the extreme. After all, > there is no need for this to be paravirtualized. > > -hpa Specifically, qemu isn't paravirtualized, it's fully virtualized. The same kernel can run on real hardware just fine. (Sort of the point of the project...) I can yank the warning for the kernels I build (or set PASS_LIMIT to 9999999), but I'd rather not carry any more patches than I can avoid... Rob -- "One of my most productive days was throwing away 1000 lines of code." - Ken Thompson.