netdev - Re: SWS for rcvbuf

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Message-Id: <20070302.112542.18305896.davem@davemloft.net>
Date:	Fri, 02 Mar 2007 11:25:42 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	alexandre.sidorenko@...com
Cc:	netdev@...r.kernel.org
Subject: Re: SWS for rcvbuf < MTU

From: Alex Sidorenko <alexandre.sidorenko@...com>
Date: Fri, 2 Mar 2007 11:28:28 -0500

> Customer has confirmed that this resolves the problem and decreases
> CPU usage by his custom application - even when there is no SWS.

There is rarely ever a reason to set explicit socket receive
buffer sizes, since the kernel dynamically sizes them based
upon how the connection is used.

Why do they set it so low?

It is just as easy to fix their performance bug by simply removing
SO_RCVBUF setting in the application.
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