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Message-ID: <20130822150046.GF13676@beaver> Date: Thu, 22 Aug 2013 19:00:46 +0400 From: Alexey Vlasov <renton@...ton.name> To: linux-kernel@...r.kernel.org Subject: Kernel migration eat CPUs Hi, Beginning from 3.7 including 3.10 kernel, I noticed that from time to time all CPUs turn out to be busy 100% and at the moment websites of my clients work slowly or don’t work at all. top screen: https://www.dropbox.com/s/psuk2cwn6exinyd/3.9.cpu_migration.jpg All CPUs are busy with kernel threads migration for about 3-5 minutes. Exactly how often it periodically happens I don’t know, but it happens once in 1-3 hours. Approximately 30 my servers work on kernel 2.6.35 and there’s no such problem there. We use kernels 3.7 – 3.9 on 5 servers and I see such effect everywhere. If you downgrade on 2.6.35, then migration doesn’t eat CPUs. These servers are used for usual LAMP shared hosting. Can I get migration as if on the kernel 2.6.35 or can this feature be disabled? -- BRGDS. Alexey Vlasov. jabber: renton@....ru icq: 5128664 -- 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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