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Re: [07/08] [TCP] Fix BIC congestion avoidance algorithm error

From:  "Theodore Ts'o" <tytso-AT-mit.edu>
To:  Greg KH <gregkh-AT-suse.de>
Subject:  Re: [07/08] [TCP] Fix BIC congestion avoidance algorithm error
Date:  Tue, 5 Apr 2005 14:22:02 -0400
Cc:  linux-kernel-AT-vger.kernel.org, stable-AT-kernel.org, davem-AT-davemloft.net, shemminger-AT-osdl.org, netdev-AT-oss.sgi.com
Archive-link:  Article, Thread

On Tue, Apr 05, 2005 at 09:47:59AM -0700, Greg KH wrote:
> 
> -stable review patch.  If anyone has any objections, please let us know.
> 
> While redoing BIC for the split up version, I discovered that the
> existing 2.6.11 code doesn't really do binary search. It ends up
> being just a slightly modified version of Reno.  See attached graphs
> to see the effect over simulated 1mbit environment.

I hate to be a stickler for the rules, but does this really meet this
criteria?

 - It must fix a real bug that bothers people (not a, "This could be a
   problem..." type thing.)

If the congestion control alogirthm is "Reno-like", what is
user-visible impact to users?  There are OS's out there with TCP/IP
stacks that are still using Reno, aren't there?  

Knowing the answer to the question, "How does this bug `bother' either
users or network administrators?" would probably be really helpful.

						- Ted




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