On Fri, 7 Jul 2000, Chris Torek wrote:

> >from sys/arch/sparc/sparc/cpu.c
> >
> >/* Machines with "buserr-type" 1 have a bug in the cache chip that affects
> >traps. */
> >
> >The "cache chip bug; trap page uncached" message is the kernel activating
> >a workaround for this bug.
> 
> For whatever it is worth, this comment and code is mine.  I put it in
> on, as I recall, advice from John Gilmore, who said that some sun4c
> CPUs had this bug.  The "buserr-type" test was my best guess at how
> such CPUs were identified.  I have never seen any official document
> saying whether this is actually right, but it did seem to work.

	How much of a performance penalty is the workaround and what sort
	of symptoms does the bug exhibit otherwise?
	(Just curious if its worth testing without the workaround on some
	sun4c boxes :)

		David/absolute
				       -- www.netbsd.org: No hype required --