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From: David Miller <davem@davemloft.net>
To: eric.dumazet@gmail.com
Cc: shemminger@vyatta.com, netdev@vger.kernel.org
Subject: Re: [PATCH] inet_peer: Optimize inet_getid()
Date: Mon, 05 Oct 2009 00:08:18 -0700 (PDT)	[thread overview]
Message-ID: <20091005.000818.95127796.davem@davemloft.net> (raw)
In-Reply-To: <4ABBDA45.2040109@gmail.com>

From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 24 Sep 2009 22:44:53 +0200

> [PATCH] inet_peer: Optimize inet_getid()
> 
> While investigating for network latencies, I found inet_getid() was a contention point
> for some workloads.
> 
> If __HAVE_ARCH_CMPXCHG is defined, we can use cmpxchg() instead of
> a spin_lock_bh()/spin_unlock_bh() pair on a central lock.
> 
> On other arches, we can use an atomic_t instead of a u16,
> and atomic_add_return(). This might grow memory usage a bit, unless
> someone invents atomic16_t :)
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>

I can't apply this, it's going to break the build on some
architectures.

For example, sparc64 only supports cmpxchg on u32 and u64
objects, but you're trying to use it on a u16 here.

  reply	other threads:[~2009-10-05  7:08 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-24 19:04 [PATCH] inet_peer: Optimize inet_getid() Eric Dumazet
2009-09-24 19:30 ` Stephen Hemminger
2009-09-24 19:57   ` Eric Dumazet
2009-09-24 20:44   ` Eric Dumazet
2009-10-05  7:08     ` David Miller [this message]
2009-10-05  7:38       ` Eric Dumazet

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