Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753460Ab3HVPCq (ORCPT ); Thu, 22 Aug 2013 11:02:46 -0400 Received: from mail.renton.name ([90.155.165.44]:37719 "EHLO beaver.old-horrors.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752929Ab3HVPCp (ORCPT ); Thu, 22 Aug 2013 11:02:45 -0400 Date: Thu, 22 Aug 2013 19:00:46 +0400 From: Alexey Vlasov To: linux-kernel@vger.kernel.org Subject: Kernel migration eat CPUs Message-ID: <20130822150046.GF13676@beaver> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1100 Lines: 32 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@1gb.ru icq: 5128664 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/