From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: Re: Regression since 4.1 Date: Mon, 28 Dec 2015 17:49:18 +0100 Message-ID: <20151228164918.GN18805@8bytes.org> References: <5418503.92eb9JWhCR@t400> <1449688068.15753.461.camel@redhat.com> <6847091.8HQyRDvvTU@pc> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <6847091.8HQyRDvvTU@pc> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Tobias Geiger Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org List-Id: iommu@lists.linux-foundation.org Hi Tobias, On Thu, Dec 10, 2015 at 12:07:57AM +0100, Tobias Geiger wrote: > It all comes down to kernel > 4.1 && iommu=on = not working here > > Hardware is: > Intel DX58SO, Intel CPU i7 920... all pretty solid running for years now, > always with iommo=on. > > I'd love to debug this further, just dont know how... Sounds like only bisecting the issue will help here. You can find an introduction on bisecting here: https://git-scm.com/book/en/v2/Git-Tools-Debugging-with-Git Would be great if you can find the time to bisect the issue. Joerg