From: Ingo Molnar <mingo@elte.hu>
To: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Cc: "'Nick Piggin'" <nickpiggin@yahoo.com.au>,
linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org
Subject: Re: Delete scheduler SD_WAKE_AFFINE and SD_WAKE_BALANCE flags
Date: Fri, 29 Jul 2005 13:26:16 +0200 [thread overview]
Message-ID: <20050729112616.GA24965@elte.hu> (raw)
In-Reply-To: <200507282308.j6SN8Tg01993@unix-os.sc.intel.com>
* Chen, Kenneth W <kenneth.w.chen@intel.com> wrote:
> To demonstrate the problem, we turned off these two flags in the cpu
> sd domain and measured a stunning 2.15% performance gain! And
> deleting all the code in the try_to_wake_up() pertain to load
> balancing gives us another 0.2% gain.
another thing: do you have a HT-capable ia64 CPU, and do you have
CONFIG_SCHED_SMT turned on? If yes then could you try to turn off
SD_WAKE_IDLE too, i found it to bring further performance improvements
in certain workloads.
Ingo
next prev parent reply other threads:[~2005-07-29 11:28 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-28 23:08 Delete scheduler SD_WAKE_AFFINE and SD_WAKE_BALANCE flags Chen, Kenneth W
2005-07-28 23:34 ` Nick Piggin
2005-07-28 23:48 ` Chen, Kenneth W
2005-07-29 1:25 ` Nick Piggin
2005-07-29 1:39 ` Chen, Kenneth W
2005-07-29 1:46 ` Nick Piggin
2005-07-29 1:53 ` Chen, Kenneth W
2005-07-29 2:01 ` Nick Piggin
2005-07-29 6:27 ` Chen, Kenneth W
2005-07-29 8:48 ` Nick Piggin
2005-07-29 8:53 ` Ingo Molnar
2005-07-29 8:59 ` Nick Piggin
2005-07-29 9:01 ` Ingo Molnar
2005-07-29 9:07 ` Ingo Molnar
2005-07-29 16:40 ` Ingo Molnar
2005-07-29 11:48 ` [patch] remove wake-balancing Ingo Molnar
2005-07-29 14:13 ` [sched, patch] better wake-balancing Ingo Molnar
2005-07-29 15:02 ` [sched, patch] better wake-balancing, #2 Ingo Molnar
2005-07-29 16:21 ` [sched, patch] better wake-balancing, #3 Ingo Molnar
2005-07-30 0:08 ` Nick Piggin
2005-07-30 7:19 ` Ingo Molnar
2005-07-31 1:15 ` Nick Piggin
2005-08-01 17:13 ` Siddha, Suresh B
2005-08-08 23:18 ` Chen, Kenneth W
2005-07-29 11:26 ` Ingo Molnar [this message]
2005-07-29 17:30 ` Delete scheduler SD_WAKE_AFFINE and SD_WAKE_BALANCE flags Chen, Kenneth W
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