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Message-Id: <201510082155.t98LtgRB002737@como.maths.usyd.edu.au> Date: Fri, 9 Oct 2015 08:55:42 +1100 From: paul.szabo@...ney.edu.au To: umgwanakikbuti@...il.com Cc: linux-kernel@...r.kernel.org, peterz@...radead.org Subject: Re: CFS scheduler unfairly prefers pinned tasks Dear Mike, >>> I see a fairness issue ... but one opposite to your complaint. >> Why is that opposite? ... > > Well, not exactly opposite, only opposite in that the one pert task also > receives MORE than it's fair share when unpinned. Two 100$ hogs sharing > one CPU should each get 50% of that CPU. ... But you are using CGROUPs, grouping all oinks into one group, and the one pert into another: requesting each group to get same total CPU. Since pert has one process only, the most he can get is 100% (not 400%), and it is quite OK for the oinks together to get 700%. > IFF ... massively parallel and synchronized ... You would be making the assumption that you had the machine to yourself: might be the wrong thing to assume. >> Good to see that you agree ... > Weeell, we've disagreed on pretty much everything ... Sorry I disagree: we do agree on the essence. :-) Cheers, Paul Paul Szabo psz@...hs.usyd.edu.au http://www.maths.usyd.edu.au/u/psz/ School of Mathematics and Statistics University of Sydney Australia -- 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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