netdev - Re: [RFC PATCH 00/12] RCU'ify the net:sched classifier chains

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Message-ID: <52D2A41E.5050609@mojatatu.com>
Date:	Sun, 12 Jan 2014 09:18:06 -0500
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	John Fastabend <john.fastabend@...il.com>,
	xiyou.wangcong@...il.com, eric.dumazet@...il.com
CC:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [RFC PATCH 00/12] RCU'ify the net:sched classifier chains

On 01/12/14 08:57, Jamal Hadi Salim wrote:

> I looked and here's a general question:
> Does even using RCU make any sense here? What we have
> is a lot of updates and very very little reads (reads essentially
> are done from the control side; the data path is is all about updates).
>
> I am not sure if RCU is a win in such a case - it could make things
> worse. At least that used to be the Truth(tm) many moons back.
> Is that not the case anymore?
>

Never mind.
You are not trying to make stats rcu - rather the list
of filters and actions (which is read mostly from data path).
Looking at the u32 piece - i think this is in the right
direction. Good stuff John!

cheers,
jamal

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