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

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Message-ID: <20080908152835.GA16834@2ka.mipt.ru>
Date:	Mon, 8 Sep 2008 19:28:35 +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 Mon, Sep 08, 2008 at 03:01:04PM +0200, Johann Baudy (johaahn@...il.com) wrote:
> > Are you sure that it is udp_push_pending_frames() and not some splice
> > waiting?
> >
> No, I'm not sure.
> Are there any queue or allocator limits that can slow the bitrate
> through this function?

No.

> I mean something that will need end of transfer to start a new one.

No, there shuld not be any such code path.

What is CPU usage on sender when it sends data via UDP sendfile()?

-- 
	Evgeniy Polyakov
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