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From: Anton Blanchard <anton@samba.org>
To: Niels Christiansen <nchr@us.ibm.com>
Cc: kiran@linux.ibm.com, lse-tech@lists.sourceforge.net,
	linux-kernel@vger.kernel.org
Subject: Re: [Lse-tech] [RFC] [PATCH] Scalable Statistics Counters
Date: Sun, 9 Dec 2001 00:46:22 +1100	[thread overview]
Message-ID: <20011208134622.GD2418@krispykreme> (raw)
In-Reply-To: <OF5920A1C3.B32C93AF-ON85256B1A.005706AC@raleigh.ibm.com>
In-Reply-To: <OF5920A1C3.B32C93AF-ON85256B1A.005706AC@raleigh.ibm.com>

 
Hi,

> > There's several things where per cpu data is useful; low frequency
> > statistics is not one of them in my opinion.
> 
> ...which may be true for 4-ways and even 8-ways but when you get to
> 32-ways and greater, you start seeing cache problems.  That was the
> case on AIX and per-cpu counters was one of the changes that helped
> get the spectacular scalability on Regatta.

I agree there are large areas of improvement to be done wrt cacheline
ping ponging (see my patch in 2.4.17-pre6 for one example), but we
should do our own benchmarking and not look at what AIX has been doing.

Anton
(ppc64 Linux Hacker)

  parent reply	other threads:[~2001-12-08 14:51 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-12-06 16:10 [Lse-tech] [RFC] [PATCH] Scalable Statistics Counters Niels Christiansen
2001-12-07  8:54 ` Dipankar Sarma
2001-12-08 22:24   ` Paul Jackson
2001-12-09  3:46     ` Jack Steiner
2001-12-09  4:44       ` Paul Jackson
2001-12-09 17:34         ` Jack Steiner
2001-12-11 23:27           ` Paul Jackson
2001-12-07 11:39 ` Ravikiran G Thirumalai
2001-12-08 13:46 ` Anton Blanchard [this message]
  -- strict thread matches above, loose matches on Subject: below --
2001-12-09 10:57 Manfred Spraul
2001-12-10 16:32 ` Jack Steiner
2001-12-10 17:00   ` Manfred Spraul
2001-12-08 17:43 Niels Christiansen
2001-12-09 11:46 ` Anton Blanchard
2001-12-07  9:52 Niels Christiansen
2001-12-07 10:10 ` Dipankar Sarma
2001-12-05 15:02 Niels Christiansen
2001-12-06 12:33 ` Ravikiran G Thirumalai
2001-12-06 13:07   ` Arjan van de Ven
2001-12-06 14:09     ` Ravikiran G Thirumalai
2001-12-06 14:10       ` Arjan van de Ven
2001-12-06 19:35         ` Dipankar Sarma
2001-12-07 21:09     ` Alex Bligh - linux-kernel
2001-12-07 21:16       ` Arjan van de Ven

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