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Date: Fri, 04 Mar 2005 16:52:55 -0800
From: Julian Elischer <julian@elischer.org>
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To: Kan Cai <kcai@cs.ubc.ca>
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cc: hackers@freebsd.org
cc: Brad Penoff <penoff@cs.ubc.ca>
Subject: Re: FreeBSD 4.11-RELEASE & SACK
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Kan Cai wrote:

>
> Greetings,
>
> I posted this question on freebsd-question list yesterday, but no 
> replies. So I am just trying my luck here. Thanks in advance.
>
> I've installed the standard FreeBSD 4.11-RELEASE and have realized 
> that the sysctl option for enabling SACK in TCP is not available 
> (net.inet.tcp.do_sack). Additionally, the tcp_sack.c file is not in 
> the /usr/src/sys/netinet so I'm guessing this indicates that I need a 
> patch. Hoping to be able to use SACK in FreeBSD 4.11-RELEASE, I wanted 
> to ask :
>
> 1) Is my guess correct (Do I need a patch)?  Or is my kernel 
> configuration file missing an option?
> 2) Assuming I need a patch, what patch is generally recommended for 
> using SACK under TCP in FreeBSD 4.11-RELEASE?


the people who contributed the SACK code contrinuted it only to the 5.x 
or later relases.
It would be up to someone else to the the back port to 4.x.

>
> Any help would be most appreciated.  Thanks,
>
> ken
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