Date: Fri, 4 Nov 2011 15:33:18 +0200 From: Ivan Klymenko <fidaj@ukr.net> To: Jeff Roberson <jroberson@jroberson.net>, Andriy Gapon <avg@FreeBSD.org> Cc: freebsd-current@freebsd.org Subject: Re: Increase the degree of interactivity ULE scheduler Message-ID: <20111104153318.0f3b9c9a@nonamehost.> In-Reply-To: <alpine.BSF.2.00.1111031120340.1995@desktop> References: <4ea29f2c.a823440a.4aa0.3599SMTPIN_ADDED@mx.google.com> <alpine.BSF.2.00.1111031018030.1995@desktop> <4eb3032e.a82eec0a.12ad.ffff8d64SMTPIN_ADDED@mx.google.com> <alpine.BSF.2.00.1111031120340.1995@desktop>
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Maybe useful the following information: This problem appears not to all architectures and types of CPU. on the Russian forums http://www.bsdportal.ru/viewtopic.php?t=24900 http://forum.lissyara.su/viewtopic.php?f=45&t=34641&sid=aa596f0b70806ba053011da911f9ccae was a brute force to find out that: there is a suspicion that: - for AMD processors, this problem is not observed at all when the number of cores >= 2 - on all single-core is the problem - only for some models with Intel >= 2 cores of the problem is not found Perhaps, after all, avg@ rights (Subject: couple of sched_ule issues), that is not working properly mechanism rebalancing and to determine the topology of CPU? All converge, because my patch ( http://docs.freebsd.org/cgi/mid.cgi?20111022132817.35db5ccd ) for SMP systems just do respite for rebalancing, which eliminates the problem with interactivity ... Thanks!
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