Messages in this thread | | | Date | Thu, 6 Mar 2003 12:05:48 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: HT and idle = poll |
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On Thu, 6 Mar 2003, Davide Libenzi wrote: > > Not only. The polling CPU will also shoot a strom of memory requests, > clobbering the CPU's memory I/O stages.
Well, that would only be true with a really crappy CPU with no caches.
Polling the same location (as long as it's a pure poll, not trying to do some locked read-modify-write cycle) should be fine. At least for something like idle-polling, where the one location it _is_ polling should not actually be touched by anybody else until the wakeup actually happens.
Linus
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