netdev - Re: [PATCH] RPS: support 802.1q and pppoe session

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Date:	Thu, 25 Mar 2010 14:09:40 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Tom Herbert <therbert@...gle.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] RPS: support 802.1q and pppoe session

On Thu, Mar 25, 2010 at 1:58 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le jeudi 25 mars 2010 à 13:47 +0800, Changli Gao a écrit :
>
>
> Hmm... we added RCU to conntrack last year only, so with 2.6.18
> conntrack hits a global lock.
>
> tcp conntrack also uses another global lock, this is not yet converted,
> even in 2.6.33.
> How can this scale ?
>

In our case, conntrack isn't a big issue, but DPI is. So we use per
connrack lock other than the global conntrack lock, and distributing
the two sides traffic belongs to the same conntrack to the same CPU,
so in normal case, there isn't any lock contention.

>
> rxhash is provided/computed only if its possible, and stay 0 if its not
> possible to compute it :)
>
> AFAIK, at this point, no network driver currently provides a rxhash. If
> you know some NIC can provide it, please submit a patch :)
>

It is a part of a private NP, and its code isn't in mainline. :(

-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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