linux-kernel - Re: [tbench regression fixes]: digging out smelly deadmen.

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Date:	Fri, 10 Oct 2008 17:25:10 +0400
From:	Evgeniy Polyakov <s0mbre@...rvice.net.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	David Miller <davem@...emloft.net>,
	Mike Galbraith <efault@....de>, Nick Piggin <npiggin@...e.de>
Subject: Re: [tbench regression fixes]: digging out smelly deadmen.

On Fri, Oct 10, 2008 at 01:40:42PM +0200, Ingo Molnar (mingo@...e.hu) wrote:
> make sure you have this fix in tip/master already:
> 
>   5b7dba4: sched_clock: prevent scd->clock from moving backwards
> 
> Note: Mike is 100% correct in suggesting that a very good cpu_clock() is 
> needed for precise scheduling.

The last commit is 5dc64a3442b98eaa and aforementioned changeset was included.
Result is quite bad:

vanilla 27: 	347.222
no TSO/GSO:	357.331
no hrticks:	382.983
no balance:	389.802
tip:		365.576

-- 
	Evgeniy Polyakov
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