From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: "Chen, Kenneth W" <kenneth.w.chen@intel.com>,
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 18:40:11 +0200 [thread overview]
Message-ID: <20050729164011.GA12138@elte.hu> (raw)
In-Reply-To: <42E9ED47.1030003@yahoo.com.au>
* Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> Chen, Kenneth W wrote:
> >Nick Piggin wrote on Thursday, July 28, 2005 7:01 PM
>
> >This clearly outlines an issue with the implementation. Optimize for one
> >type of workload has detrimental effect on another workload and vice versa.
> >
>
> Yep. That comes up fairly regularly when tuning the scheduler :(
in this particular case we can clearly separate the two workloads
though: CPU-overload (Ken's benchmark) vs. half-load (3-task tbench). So
by checking for migration target/source idleness we can have a hard
separator for wakeup balancing. (whether it works out for both types of
workloads remains to be seen)
Ingo
next prev parent reply other threads:[~2005-07-29 16:41 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 [this message]
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 ` Delete scheduler SD_WAKE_AFFINE and SD_WAKE_BALANCE flags Ingo Molnar
2005-07-29 17:30 ` Chen, Kenneth W
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