Date: Tue, 17 Jul 2001 14:48:58 -0700 (PDT) From: John Baldwin <jhb@FreeBSD.org> To: Matthew Jacob <mjacob@feral.com> Cc: hackers@FreeBSD.org, Terry Lambert <tlambert2@mindspring.com> Subject: RE: x86 unaligned access followup. Message-ID: <XFMail.010717144858.jhb@FreeBSD.org> In-Reply-To: <20010717095413.G83710-100000@wonky.feral.com>
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On 17-Jul-01 Matthew Jacob wrote: > > >> Actually, since the 486, it's been possible for us to turn on unaligned >> access exceptions on the x86. We should probably consider doing this, to >> ensure better performance, and to avoid the unnecessary bus overhead we >> eat for unaligned access today... not to mention how it could shake out >> the drivers. > > > Now *that* is a very cool idea. As Johnny Carson would say "I did not know > that". How would this be done? I assume it's some bit-flip for the chip? > D'ya have a sample bit 'o code for this? It's the AC bit in eflags. > -matt -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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