On Thu, Mar 10, 2011 at 22:13, loody [off-list ref] wrote:

hi

2011/3/8 piyush moghe [off-list ref]:

quoted

Yes what you are saying is also right, since in order to prevent the
ordering all the pending memory operations should have completed
hence as you mentioned processor stops and make sure all the memory
operations are completed.

I am not sure whether all the memory operations are completed after
cpu stops running for a while.
I think there should be a more aggressive and precise instruction ?to
handle this behavior, right?

In x86 which does strict ordering, memory barrier is rarely needed,
unless in case such as synchronization between processors or core. In
loose ordering processor such as Alpha, you really need it.

about your question "i am not sure whether all memory operations are
completion"...well, maybe you got it wrong. It's not forcing them to
complete...it make them to be done right now..... a.k.a no more
ordering..."just execute them" now. Symantically, their meanings are
different, right?

and btw, what do you mean by "aggresive and precise"?
-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
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