linux-kernel - Re: [PATCH] x86: enable DMA CMA with swiotlb

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Message-ID: <87fvqow2wn.fsf@tassilo.jf.intel.com>
Date:	Fri, 22 Nov 2013 13:19:04 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Akinobu Mita <akinobu.mita@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Re: [PATCH] x86: enable DMA CMA with swiotlb

"H. Peter Anvin" <hpa@...or.com> writes:
>
> If you have a real iotlb, why would you need contiguous memory?

iotlb is often slow.

Another use case is allocating 1GB pages at runtime.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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