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Date: Mon, 31 Oct 2011 21:06:29 +1100 From: Con Kolivas <con@...ivas.org> To: "Artem S. Tashkinov" <t.artem@...os.com> Cc: linux-kernel@...r.kernel.org Subject: Re: HT (Hyper Threading) aware process scheduling doesn't work as it should On Sun, 30 Oct 2011 07:57:12 PM Artem S. Tashkinov wrote: > I've found out that even on Linux 3.0.8 the process scheduler doesn't > correctly distributes the load amongst virtual CPUs. E.g. on a 4-core > system (8 total virtual CPUs) the process scheduler often run some > instances of four different tasks on the same physical CPU. > Any thoughts? comments? I think this is quite a serious problem. Intense cache locality logic, power saving concepts, cpu frequency governor behaviour and separate runqueues per CPU within the current CPU process scheduler in the current mainline linux kernel will ocasionally do this. Some workloads will be better, while others will be worse. Feel free to try my BFS cpu scheduler if you wish a CPU process scheduler that spreads work more evenly across CPUs. Alas the last version I synced up with will not apply cleanly past about 3.0.6 I believe: http://ck.kolivas.org/patches/bfs/3.0.0/3.0-sched-bfs-413.patch Regards, Con Kolivas -- -ck -- 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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