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Date:      Thu, 18 Apr 2002 05:36:44 -0500 (CDT)
From:      Mike Silbersack <silby@silby.com>
To:        Mark Delany <markd@BushWire.Net>
Cc:        Bill Fenner <fenner@research.att.com>, <freebsd-net@FreeBSD.ORG>
Subject:   Re: What does FreeBSD do when listen queue is full ?
Message-ID:  <20020418053441.L17827-100000@patrocles.silby.com>
In-Reply-To: <20020418011320.60326.qmail@prefix.bushwire.net>

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On 18 Apr 2002, Mark Delany wrote:

> It raises the question as to the purpose of backlog. Is it really only
> intended as a resource hint or does it represent a firm threshold
> beyond which the OS should act differently?
>
> If the latter, then the purpose of the threshold can only be of real
> benefit to the client as the server can trivially track its own
> resource usage, true?

Well, the problem with being fast and free with RSTs is that I don't think
many clients react well to them.  Hence, in the standalone server case I
suspect that Bill's idea of ignoring the ACK and waiting for it to be
retransmitted is the better idea.  After that is done, adding a sysctl
which enables the RST functionality wouldn't be a problem if you think
that it may be beneficial for those using load balancers.

Mike "Silby" Silbersack


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