* kernel patch that does wonders
@ 2011-03-19 8:44 Madovsky
2011-03-20 5:14 ` Mike Galbraith
0 siblings, 1 reply; 4+ messages in thread
From: Madovsky @ 2011-03-19 8:44 UTC (permalink / raw)
To: linux-rt-users
www.phoronix.com/scan.php?page=article&item=linux_2637_video&num=2
does anybody know this ?
sched_autogroup_enabled=1 gives some miracles apparently
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: kernel patch that does wonders
2011-03-19 8:44 kernel patch that does wonders Madovsky
@ 2011-03-20 5:14 ` Mike Galbraith
2011-03-20 17:18 ` Victor henri
0 siblings, 1 reply; 4+ messages in thread
From: Mike Galbraith @ 2011-03-20 5:14 UTC (permalink / raw)
To: Madovsky; +Cc: linux-rt-users
On Sat, 2011-03-19 at 04:44 -0400, Madovsky wrote:
> www.phoronix.com/scan.php?page=article&item=linux_2637_video&num=2
>
> does anybody know this ?
Ancient history ;-)
> sched_autogroup_enabled=1 gives some miracles apparently
No miracles there, it's just group scheduling showing it's good side.
It's in 2.6.38 if you want to give it a try.
-Mike
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: kernel patch that does wonders
2011-03-20 5:14 ` Mike Galbraith
@ 2011-03-20 17:18 ` Victor henri
2011-03-21 2:50 ` Mike Galbraith
0 siblings, 1 reply; 4+ messages in thread
From: Victor henri @ 2011-03-20 17:18 UTC (permalink / raw)
To: linux-rt-users
Hello Mike
>
> On Sat, 2011-03-19 at 04:44 -0400, Madovsky wrote:
> > www.phoronix.com/scan.php?page=article&item=linux_2637_video&num=2
> >
> > does anybody know this ?
>
> Ancient history ;-)
>
> > sched_autogroup_enabled=1 gives some miracles apparently
>
> No miracles there, it's just group scheduling showing it's good side.
> It's in 2.6.38 if you want to give it a try.
I just checked the 2.6.38 kernel; the option is not activated by default; Is it worth a try?
Will it help in any way? Will it lessen latency of a preemt kernel? or at least make it more solid?
>
> -Mike
Thank you
Victor
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: kernel patch that does wonders
2011-03-20 17:18 ` Victor henri
@ 2011-03-21 2:50 ` Mike Galbraith
0 siblings, 0 replies; 4+ messages in thread
From: Mike Galbraith @ 2011-03-21 2:50 UTC (permalink / raw)
To: Victor henri; +Cc: linux-rt-users
On Sun, 2011-03-20 at 18:18 +0100, Victor henri wrote:
> Hello Mike
>
> >
> > On Sat, 2011-03-19 at 04:44 -0400, Madovsky wrote:
> > > www.phoronix.com/scan.php?page=article&item=linux_2637_video&num=2
> > >
> > > does anybody know this ?
> >
> > Ancient history ;-)
> >
> > > sched_autogroup_enabled=1 gives some miracles apparently
> >
> > No miracles there, it's just group scheduling showing it's good side.
> > It's in 2.6.38 if you want to give it a try.
>
> I just checked the 2.6.38 kernel; the option is not activated by default; Is it worth a try?
> Will it help in any way? Will it lessen latency of a preemt kernel? or at least make it more solid?
It has both positive and negative sides, just like every other option.
There's only one way to find out what it will do for or to you. Turn it
on and find out. I use it daily.. but I turn it off when measuring max
performance, because group scheduling is not free.
If your box is always lightly loaded, you needn't bother. You'll see no
benefit, but will pay the overhead price. If you do interactive stuff
while box is chewing on a hefty load otoh, you may like it quite a lot.
-Mike
^ permalink raw reply [flat|nested] 4+ messages in thread
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2011-03-19 8:44 kernel patch that does wonders Madovsky
2011-03-20 5:14 ` Mike Galbraith
2011-03-20 17:18 ` Victor henri
2011-03-21 2:50 ` Mike Galbraith
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