netdev - Re: [PATCH 1/2] rps: core implementation

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Message-Id: <20091116.031557.61986462.davem@davemloft.net>
Date:	Mon, 16 Nov 2009 03:15:57 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	therbert@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] rps: core implementation

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 11 Nov 2009 09:20:42 +0100

> I think I'll try to extend your patches with TX completion recycling too.
>
> Ie record in skb the cpu number of original sender, and queue skb to
> remote queue for destruction (sock_wfree() call and expensive
> scheduler calls...)
>
> (This probably needs driver cooperation, instead of calling consume_skb(),
> use a different function)

You can add a new argument to consume_skb() which indicates to remote
schedule a local free.

I would also suggest to record the TX cpu at dev_hard_start_xmit()
time, rather than somewhere higher up such as the socket layer.
Otherwise you'll mess up routing/netfilter cases, and also mishandle
task migration.

But a very excellent idea.

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