lkml.org 
[lkml]   [2012]   [Feb]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: sched: Avoid SMT siblings in select_idle_sibling() if possible
* Mike Galbraith <efault@gmx.de> [2012-02-20 19:14:21]:

> > I was looking at this code due to vatsa wanting to do SD_BALANCE_WAKE.
>
> I really really need to find time to do systematic mainline testing.
>
> Enabling SD_BALANCE_WAKE used to be decidedly too expensive to consider.
> Maybe that has changed, but I doubt it. (general aside: testing with a
> bloated distro config is a big mistake)

I am seeing 2.6% _improvement_ in volanomark score by enabling SD_BALANCE_WAKE
at SMT/MC domains.

Machine : 2 Quad-core Intel X5570 CPU (H/T enabled)
Kernel : tip (HEAD at 6241cc8)
Java : OpenJDK 1.6.0_20
Volano : 2_9_0

Volano benchmark was run 4 times with and w/o SD_BALANCE_WAKE enabled in
SMT/MC domains.

Average score std. dev

SD_BALANCE_WAKE disabled 369459.750 4825.046
SD_BALANCE_WAKE enabled 379070.500 379070.5

I am going to try pipe benchmark next. Do you have suggestions for any other
benchmarks I should try to see the effect of SD_BALANCE_WAKE turned on in
SMT/MC domains?

- vatsa



\
 
 \ /
  Last update: 2012-02-23 12:15    [W:0.122 / U:13.524 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site