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Date:	Fri, 13 Nov 2009 20:50:57 -0800 (PST)
From:	David Miller <>
Subject: Re: [PATCH net-next-2.6] inetpeer: Optimize inet_getid()

From: Eric Dumazet <>
Date: Thu, 12 Nov 2009 20:33:09 +0100

> While investigating for network latencies, I found inet_getid() was a
> contention point for some workloads, as inet_peer_idlock is shared
> by all inet_getid() users regardless of peers.
> One way to fix this is to make ip_id_count an atomic_t instead
> of __u16, and use atomic_add_return().
> In order to keep sizeof(struct inet_peer) = 64 on 64bit arches
> tcp_ts_stamp is also converted to __u32 instead of "unsigned long".
> Signed-off-by: Eric Dumazet <>

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