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

[zhuyj]

On 05/07/2014 02:33 AM, Cong Wang wrote:
> On Tue, May 6, 2014 at 10:55 AM,  <josh@xxxxxxxxxxxxxxxx> wrote:
> > On Tue, May 06, 2014 at 01:16:43PM -0400, David Miller wrote:
> > > From: josh@xxxxxxxxxxxxxxxx
> > > Date: Tue, 6 May 2014 09:41:08 -0700
> > >
> > > > 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.
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