From: Chuck Ebbert <76306.1226@compuserve.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Chen, Kenneth W" <kenneth.w.chen@intel.com>,
Andrew Morton <akpm@osdl.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-ia64 <linux-ia64@vger.kernel.org>
Subject: Re: [sched, patch] better wake-balancing, #2
Date: Sat, 30 Jul 2005 23:26:40 +0000 [thread overview]
Message-ID: <200507301929_MC3-1-A601-D4C2@compuserve.com> (raw)
In-Reply-To: <20050729150207.GA6332@elte.hu>
On Fri, 29 Jul 2005 at 17:02:07 +0200, Ingo Molnar wrote:
> do wakeup-balancing only if the wakeup-CPU is idle.
>
> this prevents excessive wakeup-balancing while the system is highly
> loaded, but helps spread out the workload on partly idle systems.
I tested this with Volanomark on dual-processor PII Xeon -- the
results were very bad:
Before: 5863 messages per second
124169 schedule 64.1369
64663 _spin_unlock_irqrestore 4041.4375
7949 tcp_clean_rtx_queue 6.5370
6787 net_rx_action 24.9522
After: 5569 messages per second
139417 schedule 72.0129
82169 _spin_unlock_irqrestore 5135.5625
9949 tcp_clean_rtx_queue 8.1817
7917 net_rx_action 29.1066
__
Chuck
next prev parent reply other threads:[~2005-07-30 23:26 UTC|newest]
Thread overview: 30+ 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
2005-07-30 23:26 ` Chuck Ebbert [this message]
2005-07-31 4:35 ` [sched, patch] better wake-balancing, #2 Con Kolivas
2005-07-31 6:29 ` Ingo Molnar
2005-07-31 13:35 ` Chuck Ebbert
2005-07-29 11:26 ` Delete scheduler SD_WAKE_AFFINE and SD_WAKE_BALANCE flags Ingo Molnar
2005-07-29 17:30 ` Chen, Kenneth W
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