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Message-Id: <20070419161423.a8f5c4f0.dada1@cosmosbay.com> Date: Thu, 19 Apr 2007 16:14:23 +0200 From: Eric Dumazet <dada1@...mosbay.com> To: David Miller <davem@...emloft.net> Cc: shemminger@...ux-foundation.org, xemul@...ru, netdev@...r.kernel.org, bridge@...ts.osdl.org, devel@...nvz.org Subject: Re: [BRIDGE] Unaligned access on IA64 when comparing ethernet addresses On Wed, 18 Apr 2007 13:04:22 -0700 (PDT) David Miller <davem@...emloft.net> wrote: > > Although I don't think gcc does anything fancy since we don't > use memcmp(). It's a tradeoff, we'd like to use unsigned long > comparisons when both objects are aligned correctly but we also > don't want it to use any more than one potentially mispredicted > branch. Again, memcmp() *cannot* be optimized, because its semantic is to compare bytes. memcpy() can take into account alignement if known at compile time, not memcmp() http://lists.openwall.net/netdev/2007/03/13/31 > > We could add some alignment tests to the ethernet address > comparison code, but it's probably more trouble than it's > worth. > - > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Eric Dumazet <dada1@...mosbay.com> - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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