Date: Fri, 28 Oct 2011 15:32:44 -0700 From: Matthew Jacob <mj@feral.com> To: freebsd-arch@freebsd.org Subject: Re: newbus IO ordering semantics - moving forward Message-ID: <4EAB2D8C.1060405@feral.com> In-Reply-To: <CAJ-Vmom%2BbVbV_%2B1CJB4%2Bd209V9FjrZdvru5TG6URU2gKj47Pnw@mail.gmail.com> References: <CAJ-VmonFJG3xLn2JvarOUN6o-e7MC%2BA%2B=W9_vocZqY6L3CmTmQ@mail.gmail.com> <20111028073710.GP25601@funkthat.com> <CAJ-Vmom1M46dxby_aRYBT_FMWG5xN3kXdH-gahyrqWcBxtVyMA@mail.gmail.com> <34E9F112-930C-4836-9949-FA8A01763969@bsdimp.com> <CAJ-Vmom%2BbVbV_%2B1CJB4%2Bd209V9FjrZdvru5TG6URU2gKj47Pnw@mail.gmail.com>
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On 10/28/2011 2:08 PM, Adrian Chadd wrote: > This is the offending code. Ah, I had it wrong - lots of writes, > followed by a read: > > Few architectures follow the Sparc Comet axioms (a read of I/O space forces a flush).
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