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

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Message-ID: <1399407478.15399.81.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 06 May 2014 13:17:58 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	josh@...htriplett.org, David Miller <davem@...emloft.net>,
	andi@...stfloor.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, tom.zanussi@...ux.intel.com
Subject: Re: [PATCH 08/24] net, diet: Make TCP metrics optional

On Tue, 2014-05-06 at 11:32 -0700, Andi Kleen wrote:
> > We simply can not compete with user space, as a programmer is free to
> > keep what he really wants/needs.
> 
> Not true.

You can shake the kernel as much as you want, you wont make :
- a TCP socket
- a dentry
- an inode
- a file structure
- eventpoll structures (assuming epoll use)
- 2 dst per flow.

In 1024 bytes of memory, and keep an efficient kernel to handle
arbitrary number of sockets using the venerable and slow BSD socket api.

I was objecting to the "crazy things like LWIP" comment from Josh, not
to your patches in general.

I actually took a look at them but stopped at patch 22

Adding ~1000 lines of code to save few KB was the point I gave up.


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