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

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Date:	Fri, 10 Oct 2008 13:42:45 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Evgeniy Polyakov <s0mbre@...rvice.net.ru>
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>
Subject: Re: [tbench regression fixes]: digging out smelly deadmen.


* Evgeniy Polyakov <s0mbre@...rvice.net.ru> wrote:

> > i'm glad that you are looking into this! That is an SMP box, right? 
> > If yes then could you try this sched-domains tuning utility i have 
> > written yesterday (incidentally):
> > 
> >   http://redhat.com/~mingo/cfs-scheduler/tune-sched-domains
> 
> I've removed SD_BALANCE_NEWIDLE:
> # ./tune-sched-domains $[191-2]

> And got noticeble improvement (each new line has fixes from previous):
> 
> vanilla 27: 347.222
> no TSO/GSO: 357.331
> no hrticks: 382.983
> no balance: 389.802

okay. The target is 470 MB/sec, right? (Assuming the workload is sane 
and 'fixing' it does not mean we have to schedule worse.)

We are still way off from 470 MB/sec.

	Ingo
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