Date: Mon, 04 Jul 2005 20:06:33 +1000 From: Peter Grehan <grehan@freebsd.org> To: Robert Watson <rwatson@freebsd.org> Cc: cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org, Andrew Thompson <thompsa@freebsd.org> Subject: Re: cvs commit: src/sys/amd64/include _types.h src/sys/i386/include _types.h src/sys/net if_bridge.c src/sys/netinet ip_var.h src/sys/netinet6 ip6_var.h Message-ID: <42C90A29.2030706@freebsd.org> In-Reply-To: <20050704105721.Y2768@fledge.watson.org> References: <200507022313.j62NDWYC028248@repoman.freebsd.org> <42C90419.8070509@freebsd.org> <20050704105721.Y2768@fledge.watson.org>
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>> FYI, any modern ppc implementation doesn't require strict alignment >> for integer load/stores though there's a performance penalty for >> having to split the access into smaller ones. > > While it's not immediately relevant to the IP code, generally speaking, > is it the case that non-aligned integer reads can be non-atomic with > respect to other CPUs due to the multiple access implementation? I'd say certainly ! In fact, are there any architectures that could guarantee atomicity in this case ? later, Peter.
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