linux-kernel - Re: [test] hackbench.c interactivity results: vanilla versus SD/RSDL

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Date:	Sat, 31 Mar 2007 05:42:37 +0200
From:	Mike Galbraith <efault@....de>
To:	Xenofon Antidides <xantidides@...oo.gr>
Cc:	Ingo Molnar <mingo@...e.hu>, Con Kolivas <kernel@...ivas.org>,
	linux list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [test] hackbench.c interactivity results: vanilla versus
	SD/RSDL

On Sat, 2007-03-31 at 05:23 +0200, Mike Galbraith wrote:
> On Fri, 2007-03-30 at 19:36 -0700, Xenofon Antidides wrote:
> 
> > Something different on many cpus? Sorry I was thinking
> > something other. I try 50% run + 50% sleep on one cpu
> > and mainline has big problem. Sorry for bad code I
> > copy bits to make it work. Start program first then
> > run bash 100% cpu (while : ; do : ; done). Try change
> > program forks from 1 till 3 or more mainline kernel
> > and bash gets 0%.
> 
> top - 05:16:41 up 43 min, 13 users,  load average: 9.51, 4.32, 5.67
> 
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  P COMMAND
>  7146 root      15   0  1564  104   24 R   43  0.0   0:20.74 0 fiftypercent
>  7142 root      15   0  1564  104   24 S   37  0.0   0:18.08 0 fiftypercent
>  7140 root      15   0  1564  436  356 R   21  0.0   0:18.94 1 fiftypercent
>  7144 root      15   0  1564  104   24 R   21  0.0   0:18.75 1 fiftypercent
>  7143 root      15   0  1564  104   24 R   20  0.0   0:18.85 1 fiftypercent
>  7145 root      15   0  1564  104   24 R   19  0.0   0:18.30 1 fiftypercent
>  7147 root      15   0  1564  104   24 R   19  0.0   0:18.03 1 fiftypercent
>  7141 root      16   0  1564  104   24 R   10  0.0   0:18.29 0 fiftypercent
>  6245 root      16   0  3368 1876 1376 R    7  0.2   0:49.81 0 bash
> 
> That's mainline with the below (which I'm trying various ideas to improve).

Note: that's not an sh -c started at the same time as the 50% duty cycle
dos, the pertinent data is that bash is getting into the loop.

Yesterday, I piddled around with tracking interactive backlog as a way
to detect when the load isn't really an interactive load, that's very
simple and has potential.

	-Mike

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