netdev - RE: A reduced Linux network stack for small systems

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D0F70CFB5@AcuExch.aculab.com>
Date:	Tue, 6 May 2014 09:18:25 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Andi Kleen' <andi@...stfloor.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tom.zanussi@...ux.intel.com" <tom.zanussi@...ux.intel.com>
Subject: RE: A reduced Linux network stack for small systems

From: Andi Kleen
> There has been a lot of interest recently to run Linux on very small systems,
> like Quark systems. These may have only 2-4MB memory. They are also limited
> by flash space.

I'm intrigued about the 2-4MB memory.
That is more that would typically be available on-chip in a DSP or FPGA.
It sounds like an expensive SRAM chip.
OTOH a single SDRAM gives 16MB and DDR a lot more - and are a lot cheaper
and lower power.
Most modern silicon can easily have SDRAM/DDR interfaces.

You may want some size reduction to run in 16MB, but it is not as problematic
as running in 2MB.

With that little memory I wouldn't want to run anything that relied on
dynamic memory allocation (after startup) - except for fixed size data
buffers.

	David

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