>Are the balances you're doing on wakeup global or node-local?
The test is not done on NUMA systems.
Regards,
Mala
Mala Anand
IBM Linux Technology Center - Kernel Performance
E-mail:[email protected]
http://www-124.ibm.com/developerworks/opensource/linuxperf
http://www-124.ibm.com/developerworks/projects/linuxperf
Phone:838-8088; Tie-line:678-8088
"Martin J. Bligh"
<[email protected]> To: Mala Anand/Austin/IBM@IBMUS, Erich Focht <[email protected]>, linux-kernel
Sent by: <[email protected]>, LSE <[email protected]>
[email protected] cc: Andi Kleen <[email protected]>, [email protected]
ceforge.net Subject: Re: [Lse-tech] Re: [patch] scheduler fix for 1cpu/node case
07/29/2003 09:29 AM
>>> If you want data supporting my assumptions: Ted Ts'o's talk at OLS
>>> shows the necessity to rebalance ASAP (even in try_to_wake_up).
>
>> If this is the patch I am thinking of, it was the (attached) one I sent
> them,
>> which did a light "push" rebalance at try_to_wake_up. Calling
> load_balance
>> at try_to_wake_up seems very heavy-weight. This patch only looks for an
> idle
>> cpu (within the same node) to wake up on before task activation, only if
> the
>> task_rq(p)->nr_running is too long. So, yes, I do believe this can be
>> important, but I think it's only called for when we have an idle cpu.
>
> The patch that you sent to Rajan didn't yield any improvement on
> specjappserver so we did not include that in the ols paper. What
> is described in the ols paper is "calling load-balance" from
> try-to-wake-up. Both calling load-balance from try-to-wakeup and
> the "light push" rebalance at try_to_wake_up are already done in
> Andrea's 0(1) scheduler patch.
Are the balances you're doing on wakeup global or node-local?
M.
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