Messages in this thread | | | Date | Thu, 23 Feb 2012 16:19:59 +0530 | From | Srivatsa Vaddagiri <> | Subject | Re: sched: Avoid SMT siblings in select_idle_sibling() if possible |
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* 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
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