netdev - Re: [PATCH net-next] neigh: speedup neigh_resolve

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Message-Id: <20101011.121609.246536311.davem@davemloft.net>
Date:	Mon, 11 Oct 2010 12:16:09 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] neigh: speedup neigh_resolve_output()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 07 Oct 2010 22:44:07 +0200

> Le jeudi 07 octobre 2010 à 14:53 +0200, Eric Dumazet a écrit :
> 
>> Further improvements would need to use a seqlock instead of an rwlock to
>> protect neigh->ha[], to not dirty neigh too often and remove two atomic
>> ops.
>> 
> 
> I implemented this idea in following patch, on top on previous one.
> 
> [PATCH net-next] neigh: speedup neigh_resolve_output()

So Eric do you think this is more efficient than the idea I
proposed, which is to "cmpxchg 'hh' and RCU"?

If you think this seqlock thing is faster or more desirable
for some reason, I'll add it.

Thanks!
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