From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756393Ab1FFMWY (ORCPT ); Mon, 6 Jun 2011 08:22:24 -0400 Received: from mga14.intel.com ([143.182.124.37]:23444 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754357Ab1FFMWW (ORCPT ); Mon, 6 Jun 2011 08:22:22 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.65,326,1304319600"; d="scan'208";a="7739619" Date: Mon, 6 Jun 2011 13:09:45 +0100 From: Alan Cox To: Jiri Slaby Cc: gregkh@suse.de, jirislaby@gmail.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH] serial: 8250, increase PASS_LIMIT Message-ID: <20110606130945.7ad9edef@bob.linux.org.uk> In-Reply-To: <1307307109-27776-1-git-send-email-jslaby@suse.cz> References: <1307307109-27776-1-git-send-email-jslaby@suse.cz> Organization: Intel X-Mailer: Claws Mail 3.7.8 (GTK+ 2.22.0; x86_64-redhat-linux-gnu) Organisation: Intel Corporation UK Ltd, registered no. 1134945 (England), Registered office Pipers Way, Swindon, SN3 1RJ 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 On Sun, 5 Jun 2011 22:51:49 +0200 Jiri Slaby wrote: > From: Jiri Slaby > > With virtual machines like qemu, it's pretty common to see "too much > work for irq4" messages nowadays. This happens when a bunch of output > is printed on the emulated serial console. This is caused by too low > PASS_LIMIT. When ISR loops more than the limit, it spits the message. > > I've been using a kernel with doubled the limit and I couldn't see no > problems. Maybe it's time to get rid of the message now? We need a limit to deal with hangs caused by misconfiguration / mis-detection on ISA ports in particular but we can certainly bump the limit to handle poor emulations.