Date: Wed, 30 Sep 2009 15:43:19 +0200 From: Ivan Voras <ivoras@freebsd.org> To: Attilio Rao <attilio@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r197643 - in head/sys: kern sys Message-ID: <9bbcef730909300643k56e40be9xc8b8287dc2971ac3@mail.gmail.com> In-Reply-To: <200909301326.n8UDQVB1016396@svn.freebsd.org> References: <200909301326.n8UDQVB1016396@svn.freebsd.org>
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2009/9/30 Attilio Rao <attilio@freebsd.org>: > Author: attilio > Date: Wed Sep 30 13:26:31 2009 > New Revision: 197643 > URL: http://svn.freebsd.org/changeset/base/197643 > > Log: > =C2=A0When releasing a read/shared lock we need to use a write memory bar= rier > =C2=A0in order to avoid, on architectures which doesn't have strong order= ed > =C2=A0writes, CPU instructions reordering. Will this influence performance on those architecture that do?
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