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Date: Wed, 20 Oct 2010 15:43:28 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Damien Wyart <damien.wyart@...e.fr> Cc: Chase Douglas <chase.douglas@...onical.com>, Ingo Molnar <mingo@...e.hu>, tmhikaru@...il.com, Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org, Venkatesh Pallipadi <venki@...gle.com> Subject: Re: High CPU load when machine is idle (related to PROBLEM: Unusually high load average when idle in 2.6.35, 2.6.35.1 and later) On Wed, 2010-10-20 at 15:30 +0200, Peter Zijlstra wrote: > On Wed, 2010-10-20 at 15:27 +0200, Damien Wyart wrote: > > > > Should'nt we enlarge the list of CC, because for now, responsivity has > > been close to 0 and it seems we will get a 2.6.36 with buggy load avg > > calculation. Even if it is only statistics, many supervision tools rely > > on the load avg, so for production environments, this is not a good > > thing. > > It already contains all the folks who know the code I'm afraid.. :/ > > I've been playing with it a bit more today, but haven't actually managed > to make it better, just differently worse.. Ah, I just remembered Venki recently poked at this code too, maybe he's got a bright idea.. Venki, there are cpu-load issues, the reported issue is that idle load is too high, and I think I can see that happening with the current code (due to 74f5187ac8). The flaw I can see in that commit is that we can go idle multiple times during the LOAD_FREQ window, which will basically inflate the idle contribution. All attempts from me to fix that so far have resulted in curious results.. Would you have a moment to also look at this? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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