Re: Regarding report amount of usable graphics memory

From: Daniel Vetter <daniel.vetter@intel.com>
To: "Zhang, Jianhong" <jianhong.zhang@intel.com>,
	"intel-gfx@lists.freedesktop.org"
	<intel-gfx@lists.freedesktop.org>
Subject: Re: Regarding report amount of usable graphics memory
Date: Wed, 27 Nov 2013 09:06:42 +0100	[thread overview]
Message-ID: <5295A812.8020805@intel.com> (raw)
In-Reply-To: <65796F1B29BD054D806D4A5CE6F71FF85A4DAFBD@ORSMSX106.amr.corp.intel.com>

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On 27/11/2013 06:41, Zhang, Jianhong wrote:
>
> Hi Daniel,
>
> 1.On Harris Beach, we always see this report as below even we set 
> different TOLUD size, such as1GB, 1.5GB, 2GB and 3GB :
>
> [drm] Memory usable by graphics device = 2048M
>
>        2.   Based on the implementation below, it shouldn't matter 
> with TOLUD size.
>
>              DRM_INFO("Memory Usable by graphics device = %dM\n", 
> dev_priv->mm.gtt->gtt_total_entries >> 8);
>
> Please confirm if this is the case:
>
> If RAM is 4GB, it will report 2048M as the usable memory by graphics 
> device.
>
> This is the max size that graphics could use,  and it shouldn't change 
> based on TOLUD size.
>
Yeah. But the real question is what do you need this for exactly? Also, 
cc'ing relevant internal mailing lists.
-Daniel
>
> Best regards,
>
> Jianhong
>

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