linux-kernel - Re: [PATCH] drm/i915: By default, enable RC6 on IVB and SNB when reasonable

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: <20111122201531.GD5547@srcf.ucam.org>
Date:	Tue, 22 Nov 2011 20:15:31 +0000
From:	Matthew Garrett <mjg@...hat.com>
To:	Keith Packard <keithp@...thp.com>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/i915: By default, enable RC6 on IVB and SNB when
 reasonable

On Fri, Nov 18, 2011 at 10:41:29PM -0800, Keith Packard wrote:

> +	/*
> +	 * Only enable RC6 if all dma remapping is disabled, or if
> +	 * there's no iommu present in the machine.
> +	 */
> +	if (INTEL_INFO(dev)->gen == 6)
> +		return no_iommu || dmar_disabled;

So the user has to choose between 5W of power saving or having dmar? And 
we default to giving them dmar? I think that's going to come as a 
surprise to people.

-- 
Matthew Garrett | mjg59@...f.ucam.org
--
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/