Messages in this thread | | | Date | Thu, 12 Dec 2013 07:06:57 -0800 | From | "H. Peter Anvin" <> | Subject | Re: 50 Watt idle power regression bisected to Linux-3.10 |
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On 12/12/2013 05:28 AM, Ingo Molnar wrote: >> >> The reason we use thread_info::flags is because we need to write >> TIF_NEED_RESCHED into it to wake up anyhow. >> >> Using another cacheline would mean the wakeup path would need to write a >> second cross cpu cacheline -- that is badness too. >> >> So no, I don't think we want to listen to another line. >
Right, okay, so that's the implicit wakeup. However, I would think the CLFLUSH would hurt a lot more.
-hpa
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