linux-kernel - RE: Frontswap [PATCH 0/4] (was Transcendent Memory): overview

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Message-ID: <f038ee35-8b34-4305-b93a-49383c86f83e@default>
Date:	Mon, 26 Apr 2010 05:45:57 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org, jeremy@...p.org,
	hugh.dickins@...cali.co.uk, ngupta@...are.org, JBeulich@...ell.com,
	chris.mason@...cle.com, kurt.hackel@...cle.com,
	dave.mccracken@...cle.com, npiggin@...e.de,
	akpm@...ux-foundation.org, riel@...hat.com
Subject: RE: Frontswap [PATCH 0/4] (was Transcendent Memory): overview

> dma engines are present on commodity hardware now:
> 
> http://en.wikipedia.org/wiki/I/O_Acceleration_Technology
> 
> I don't know if consumer machines have them, but servers certainly do.
> modprobe ioatdma.

They don't seem to have gained much ground in the FIVE YEARS
since the patch was first posted to Linux, have they?

Maybe it's because memory-to-memory copy using a CPU
is so fast (especially for page-ish quantities of data)
and is a small percentage of CPU utilization these days?
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