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

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Message-ID: <20080910060900.GA12158@2ka.mipt.ru>
Date:	Wed, 10 Sep 2008 10:09:01 +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

Hi Johann.

On Wed, Sep 10, 2008 at 01:11:31AM +0200, Johann Baudy (johaahn@...il.com) wrote:
> We've performed more tests with additional and mandatory processes of
> our system. Bitrate and CPU performance were very very low. This
> result leads us to brainstorm on a new system design that meets
> specifications target. I'll continue these tests once new design
> ready.

If CPU usage was small, something slept somewhere, but so far we do not
know what and where. It would be great to understand, why sendfile() is
so slow with UDP especially when mempry bandwidth is very small, and
particulary understand if it is udp sending path itself or splice code.

> Concerning udp_sendpage() patch, if you agree, I will suggest this
> patch to the community in a new thread.

Sure, but please remove commented code lines instead of commenting them.

-- 
	Evgeniy Polyakov
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