netdev - Re: [PATCH net-next] ipv4: speedup ip_idents

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Message-Id: <20150501.194413.195074972640434346.davem@davemloft.net>
Date:	Fri, 01 May 2015 19:44:13 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ipv4: speedup ip_idents_reserve()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 01 May 2015 10:37:49 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Under stress, ip_idents_reserve() is accessing a contended
> cache line twice, with non optimal MESI transactions.
> 
> If we place timestamps in separate location, we reduce this
> pressure by ~50% and allow atomic_add_return() to issue
> a Request for Ownership.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Looks good, applied, thanks Eric.
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