netdev - Re: [PATCH] TX_RING and packet mmap

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Message-ID: <alpine.DEB.1.10.0904211657500.31780@qirst.com>
Date:	Tue, 21 Apr 2009 17:00:52 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Johann Baudy <johann.baudy@...-log.net>
cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] TX_RING and packet mmap

On Tue, 21 Apr 2009, Johann Baudy wrote:

> > Duh. So I cannot concurrently operate with multiple threads on the
> > structure.
> Except if you can ensure that multiple threads will not use the same buffer.

Hmmm... Ok.

> > The kernel synchronizes with itself via the socket?
> Not sure to understand?

Doesnt the kernel need some way to synchronize the two
transitions made by the kernel? From "send request" to "sending" and then
to "available"? Otherwise the kernel may set the request to "available"
before the change from "send request" to "sending" is complete.
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