Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S936211AbcJUTro (ORCPT ); Fri, 21 Oct 2016 15:47:44 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:53315 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933903AbcJUTrn (ORCPT ); Fri, 21 Oct 2016 15:47:43 -0400 Date: Fri, 21 Oct 2016 21:45:10 +0200 (CEST) From: Thomas Gleixner To: Michal Necasek cc: stern@rowland.harvard.edu, michael.thayer@oracle.com, knut.osmundsen@oracle.com, linux-kernel@vger.kernel.org Subject: Re: PROBLEM: OHCI watchdog timeouts inside VirtualBox, probably due to timer wheel rework In-Reply-To: Message-ID: References: User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 477 Lines: 16 On Fri, 21 Oct 2016, Michal Necasek wrote: > I'll get back to you on whether increasing the timeout helps, it'll take > a bit of testing. Does it actually sound plausible that some controllers > could not get things done in 250ms but could in 275ms? There is a bug in the new timer wheel code, which causes a timer to fire way too early. That USB timeout is just exposing the issue. We do not yet understand the issue completely, but we are working on it. Thanks, tglx