Re: [PATCH 08/24] net, diet: Make TCP metrics optional

On 05/07/2014 02:33 AM, Cong Wang wrote:

On Tue, May 6, 2014 at 10:55 AM,  [off-list ref] wrote:

quoted

On Tue, May 06, 2014 at 01:16:43PM -0400, David Miller wrote:

quoted

From: josh@joshtriplett.org
Date: Tue, 6 May 2014 09:41:08 -0700

quoted

Every KB of RAM costs real money and SoC die area (for eDRAM/eSRAM).

Another poster commented that 16MB of DRAM would be cheaper than
the 2MB of ram you have on these boards, probably one that fits
your size profile is available as well.

2MB is just a rediculous restriction.

Embedded systems experts disagree with you there; there *are* systems
where the most cost-efficient approach is a few MB (or a few hundred KB)
of non-discrete memory.  We're not talking about socketed memory or even
soldered-down memory; we're talking about entire systems that fit on a
small SoC die.  The space not used by that extra RAM may well be better
spent on CPU optimizations, or some other integrated component.

Such boards will be built, and many of them will run Linux, despite your
incredulity.  When you're building millions of a board, it's well worth
optimizing software to eliminate components from the bill of materials.

So why bothers 3.15+ Linux kernel? Why not use an old kernel e.g. 2.4.x?
2.4.x kernel doesn't have so many new features you want to get rid of here.

Maybe 2.4.x kernel doesn't have so many new features that we want to use 
here.

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html