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

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Message-ID: <20140506202719.GD21332@cloud>
Date:	Tue, 6 May 2014 13:27:19 -0700
From:	josh@...htriplett.org
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Andi Kleen <ak@...ux.intel.com>,
	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, May 06, 2014 at 01:17:58PM -0700, Eric Dumazet wrote:
> 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.

My primary statement was that it's crazy to use something like LWIP just
because you want a *tiny* system.  We could argue about using LWIP
because you want a massively scalable system, or one that more closely
couples userspace and the kernel, but that's not the current goal in any
case.  So let's drop that branch of the thread. :)

> 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.

Please consider ignoring that one and reading the rest; we could always
handle the routing table issue separately.

- Josh Triplett
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