netdev - Re: [PATCH RFC] Per route TCP options

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Date:	Tue, 20 Oct 2009 22:13:54 -0400
From:	Bill Fink <billfink@...dspring.com>
To:	Gilad Ben-Yossef <gilad@...efidence.com>
Cc:	netdev@...r.kernel.org, ori@...sleep.com
Subject: Re: [PATCH RFC] Per route TCP options

On Tue, 20 Oct 2009, Gilad Ben-Yossef wrote:

> Turn the global sysctls allowing disabling of TCP SACK, DSCAK,
> time stamp and window scale into per route entry feature options,
> laying the ground to future removal of the relevant global sysctls.
> 
> You really only want to disable SACK, DSACK, time stamp or window
> scale if you've got a piece of broken networking equipment somewhere 
> as a stop gap until you can bring a big enough hammer to deal with
> the broken network equipment. It doesn't make sense to "punish" the
> entire connections going through the machine to destinations not 
> related to the broken equipment.

For certain test situations, it is sometimes desirable to globally
disable TCP timestamps.  Although I have not personally wanted to
globally disable the other mentioned features, I can imagine test
scenarios where it could be useful.  Admittedly it could also be
accomplished with per route features, just not as conveniently,
especially if there are a large number of interfaces and/or routes.

						-Bill
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