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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. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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