Date: Wed, 14 Oct 1998 13:39:29 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Jason Thorpe <thorpej@nas.nasa.gov> Cc: Chris Csanady <ccsanady@friley-185-114.res.iastate.edu>, freebsd-alpha@FreeBSD.ORG Subject: Re: kernel traps on boot.. Message-ID: <13860.57411.377077.88475@grasshopper.cs.duke.edu> In-Reply-To: <199810141710.KAA08380@lestat.nas.nasa.gov> References: <199810141710.KAA08380@lestat.nas.nasa.gov>
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Jason Thorpe writes: > > to the console. All unaligned accesses in the kernel are bugs, hence the > panic. Changing the kernel to fixup unaligned access in the kernel is > just plain wrong. In general I agree -- we found a really stupid performance bug in our Myrinet messaging system after we upgraded to DU4.0d (which doesn't fixup unaligned access faults in kernel mode) & realized we were taking an unaligned access trap in a certain chunk of frequently called code. However, I think its a perfectly acceptable temporary local hack when the unaligned access trap's are somebody else's fault & are preventing you from making forward progress on your own project.. Drew ------------------------------------------------------------------------------ Andrew Gallatin, Sr Systems Programmer http://www.cs.duke.edu/~gallatin Duke University Email: gallatin@cs.duke.edu Department of Computer Science Phone: (919) 660-6590 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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