Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses)

From: Jiri Kosina <jkosina@suse.cz>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Peter Hurley <peter@hurleysoftware.com>,
	Alan Stern <stern@rowland.harvard.edu>,
	Thomas Meyer <thomas@m3y3r.de>,
	Shawn Starr <shawn.starr@rogers.com>,
	Kernel development list <linux-kernel@vger.kernel.org>,
	USB list <linux-usb@vger.kernel.org>,
	linux-acpi@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
	linux-pci@vger.kernel.org, Yinghai Lu <yinghai@kernel.org>
Subject: Re: [3.9-rc1] irq 16: nobody cared  (was [3.9-rc1] very poor interrupt responses)
Date: Fri, 15 Mar 2013 08:59:06 +0100 (CET)	[thread overview]
Message-ID: <alpine.LNX.2.00.1303150851020.9529@pobox.suse.cz> (raw)
In-Reply-To: <5657408.cYX6iimiA4@vostro.rjw.lan>

On Thu, 14 Mar 2013, Rafael J. Wysocki wrote:

> > > commit 181380b702eee1a9aca51354d7b87c7b08541fcf
> > > Author: Yinghai Lu <yinghai@kernel.org>
> > > Date:   Sat Feb 16 11:58:34 2013 -0700
> > > 
> > >     PCI/ACPI: Don't cache _PRT, and don't associate them with bus numbers
> > 
> > This patch __fixed__ this problem for me in linux-next back in February.
> > 
> > Rafael, did you hold back some ACPI patches from 3.9 that would have
> > made fix no longer applicable?
> 
> No, I didn't.
> 
> I'm afraid, though, that the fix might not be effective on some systems for a
> reason that's unclear at the moment.
> 
> So in fact the one to check is commit 4f535093cf ("PCI: Put pci_dev in device
> tree as early as possible") and if the problem doesn't appear before that, we
> need to figure out why the fix may not be sufficient.

With either 4f535093cf or 181380b702 I do *not* see the problem, i.e. 
these commits are not the culprit and it was caused by some later change.

I will proceed with bisect now, hopefully it'll produce a meaningful 
result.

-- 
Jiri Kosina
SUSE Labs