From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 15328] high load avg, extreme sluggishness on T41 w/ Radeon
Mobility M7
Date: Tue, 16 Feb 2010 21:24:33 GMT
Message-ID: <201002162124.o1GLOXmV025187@demeter.kernel.org>
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http://bugzilla.kernel.org/show_bug.cgi?id=15328
--- Comment #3 from Thomas Hellstrom 2010-02-16 21:24:27 ---
Really, The Radeon driver *should* never change caching policy from WC to UC,
and thus never hit the code path affected by that patch. However if it does,
and particularly if it does frequently it's quite natural that the patch causes
severe CPU overhead since transition from WC->WB->UC causes a cache flush
whereas WC->UC doesn't.
Maybe Jerome has some input?
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