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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>
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Cc: freebsd-current@freebsd.org
Subject: Re: Increase the degree of interactivity ULE scheduler
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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!