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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <alpine.LNX.2.00.1303182304320.9529@pobox.suse.cz>
Date:	Mon, 18 Mar 2013 23:05:02 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Harald Arnesen <skogtun.linux@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Peter Hurley <peter@...leysoftware.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Thomas Meyer <thomas@...3r.de>,
	Shawn Starr <shawn.starr@...ers.com>,
	USB list <linux-usb@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org, Daniel Vetter <daniel.vetter@...ll.ch>,
	Imre Deak <imre.deak@...el.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt
 responses)

On Mon, 18 Mar 2013, Yinghai Lu wrote:

> > Yes, switching from MSI to IO-APIC-fasteoi makes the report about lost
> > interrupts go away.
> >
> > My understanding from the other mail is that DAniel Vetter already has an
> > idea what might be going wrong with IRQ acking on GM45 chipsets; hopefully
> > this datapoint regarding MSI will fit into it.
> 
> What is /proc/interrupts difference between with and without pci=nomsi ?
> 
> drm is forced to share irq 16?

Yup, IRQ 16 is being shared, and one of the owners is i915.

-- 
Jiri Kosina
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/