linux-kernel - Re: PROBLEM: OHCI watchdog timeouts inside VirtualBox, probably due to timer wheel rework

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Message-ID: <alpine.DEB.2.20.1610212142040.4855@nanos>
Date:   Fri, 21 Oct 2016 21:45:10 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Michal Necasek <michal.necasek@...cle.com>
cc:     stern@...land.harvard.edu, michael.thayer@...cle.com,
        knut.osmundsen@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: OHCI watchdog timeouts inside VirtualBox, probably due
 to timer wheel rework

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