On 18 Nov, Zach Brown wrote:
>
>> >(sysctl-ized) in FBSD (Some work have been done in Linux, since a
>> >well-known comparative benchmark offense). Would be even more usefull
>> >in SMP context.
>
> I don't think the wake-many problem was ever the cause of the poor numbers
> that comparitve benchmark unearthed. This is only a problem if you have a
> whole slew of children sitting around waiting for new connections, rather
> than doing real work. this sure isn't the environment a heavily loaded
> server is under :) If you're still curious, check out
>
> http://www.kegel.com/mindcraft_redux.html
>
> specifically
>
> http://kernelnotes.org/lnxlists/linux-kernel/lk_9906_04/msg01100.html
>
I agree that it is not the sole problem (as, for exemple, the
discussions in the MC-redux shows that topics quickly went past the
thundering herd) but it's a recurrent irritating (for mind) thing.
Also, as the processes in a select/acccept loop will go user-mode, this
means BGL contention in SMP, reducing the processing capacity to a
single processor. I noticed that system activity tend to grow more
quickly than user activity and these un-necessary wakeups are part of
it. Am I wrong ?
RN.
IeM
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