netdev - Re: Userspace network stack and netchannels.

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Date:	Tue, 25 Sep 2007 12:34:44 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	netdev@...r.kernel.org
Subject: Re: Userspace network stack and netchannels.

On Tue, 25 Sep 2007 22:00:48 +0400
Evgeniy Polyakov <johnpol@....mipt.ru> wrote:

> Hi.
> 
> I've released new version of the extremely small 
> userspace netowork stack [1] implementation.
> Stack supports TCP and UDP over IP.
> It works on top of netchannels [2] or packet socket 
> (returned back in this release).
> 
> Supported features:
> 	* TCP/UDP sending and receiving.
> 	* Timestamp, window scaling, MSS TCP options.
> 	* PAWS.
> 	* Slow start and congestion control.
> 	* Socket-like interface.
> 	* Retransmit and fast retransmit support.
> 	* support for TCP listen state (only point-to-point mode,
> 		i.e. no new data channels are created, when new client is
> 		connected, instead state is changed according to protocol
> 		(TCP state is changed to ESTABLISHED).
> 	* support for the netchannels and packet socket interface.
> 
> It was proven [3] that unetstack can be *much* faster than vanilla TCP
> stack (mainly because of heavily reduced number of syscalls, different
> congestion control algorithm and other features).

I am glad to see a more complete implementation for comparison, but
by changing several variables at once it makes it hard to evaluate whether
the improvement comes from user space TCP or the other changes.
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