netdev - Re: Fwd: Packet mmap: TX RING and zero copy

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Message-ID: <20080908153841.GA24683@2ka.mipt.ru>
Date:	Mon, 8 Sep 2008 19:38:42 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Johann Baudy <johaahn@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Fwd: Packet mmap: TX RING and zero copy

On Mon, Sep 08, 2008 at 07:28:35PM +0400, Evgeniy Polyakov (johnpol@....mipt.ru) wrote:
> What is CPU usage on sender when it sends data via UDP sendfile()?

Actually we can determine the culprit via putting a loop into
udp_sendpage(), which will send the same data. if receiver will see the
same delayes, problem in the udp sending path, otherwise in splice code.

-- 
	Evgeniy Polyakov
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