netdev - Re: [PATCH] inet_peer: Optimize inet

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Message-ID: <20090924123020.59a2ee6e@s6510>
Date:	Thu, 24 Sep 2009 12:30:20 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH] inet_peer: Optimize inet_getid()

On Thu, 24 Sep 2009 21:04:56 +0200
Eric Dumazet <eric.dumazet@...il.com> wrote:

> While investigating for network latencies, I found inet_getid() was a contention point
> for some workloads.
> 
> Fix is straightforward, using cmpxchg() instead of
> a spin_lock_bh()/spin_unlock_bh() pair on a central lock.
> 
> Another possibility was to use an atomic_t and atomic_add_return() but
> the size of struct inet_peer object would had doubled on x86_64 because of
> SLAB_HWCACHE_ALIGN constraint.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

I thought cmpxchg was not available on all architectures.
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