linux-kernel - Re: local_add

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Message-Id: <20081215.231314.92267481.davem@davemloft.net>
Date:	Mon, 15 Dec 2008 23:13:14 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	rusty@...tcorp.com.au
Cc:	rostedt@...dmis.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, mathieu.desnoyers@...ymtl.ca,
	paulus@...ba.org, benh@...nel.crashing.org
Subject: Re: local_add_return

From: Rusty Russell <rusty@...tcorp.com.au>
Date: Tue, 16 Dec 2008 17:03:00 +1030

> Now, I posted a benchmark patch before for archs to test.  I'm interested
> in Sparc64.

Here ya go:

UltraSPARC-IIIi:

	atomic_long:	local_inc=8180000021/243
			local_add=7469999999/222
			cpu_local_inc=1260000001/37
			local_read=5690000000/169
			(total was 1326071152640)

	irqsave/restore:
			local_inc=6909999997/205
			local_add=6899999996/205
			cpu_local_inc=860000000/25
			local_read=5690000005/169
			(total was 1326071152640)

	trivalue:
			local_inc=6490000000/193
			local_add=6500000000/193
			cpu_local_inc=370000002/11
			local_read=7419999998/221
			(total was 1326071152640)

	local_t:
			local_inc=7440000000/221
			local_add=7440000000/221
			cpu_local_inc=1260000004/37
			local_read=5689999997/169
			(total was 1326071152640, warm_total 34443624448)

Niagara-2:

	atomic_long:
		local_inc=6960000013/207
		local_add=6940000002/206
		cpu_local_inc=2440000002/72
		local_read=5390000000/160
		(total was 1326071152640)

	irqsave/restore:
		local_inc=7660000002/228
		local_add=7669999999/228
		cpu_local_inc=2650000004/78
		local_read=5379999999/160
		(total was 1326071152640)

	trivalue:
		local_inc=5789999998/172
		local_add=5789999995/172
		cpu_local_inc=689999994/20
		local_read=7470000000/222
		(total was 1326071152640)

	local_t:
		local_inc=6940000000/206
		local_add=6950000000/207
		cpu_local_inc=2460000000/73
		local_read=5390000004/160
		(total was 1326071152640, warm_total 34443624448)

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