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Date:	Mon, 2 Apr 2007 16:01:13 -0400
From:	Alex Sidorenko <>
To:	John Heffner <>
Cc:	David Miller <>,
Subject: Re: SWS for rcvbuf < MTU

On March 14, 2007 12:18:56 pm Alex Sidorenko wrote:
> On March 13, 2007 03:01:50 pm John Heffner wrote:
> > Sorry for the long delay in response, I've been on vacation.  I'm okay
> > with your patch, and I can't think of any real problem with it, except
> > that the behavior is non-standard.  Then again, Linux acking in general
> > is non-standard, which has created the bug in the first place. :)  The
> > only thing I can think where it might still ack too often is if
> > free_space frequently drops just below full_space/2 for a bit then rises
> > above full_space/2.
> >
> > I've also attached a corrected version of my earlier patch that I think
> > solves the problem you noted.
> Hello John,
> I think your corrected version should avoid the problem I mentioned, but I
> will still ask the customer to test the new version. It will be interesting
> to compare traffic patterns with those observed with stock kernel and my
> earlier patch.
> It might take some time to do proper testing, I'll inform you as soon as
> there are any results.

Hello John,

our customer has tested your patch thoroughly and everything's working fine. 
Please apply the patch if this is not done yet.


Alexandre Sidorenko             email:
Global Solutions Engineering:   Unix Networking
Hewlett-Packard (Canada)
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