Date: Wed, 23 Mar 2011 13:51:21 +0200 From: Andriy Gapon <avg@freebsd.org> To: Matthew Jacob <mj@feral.com> Cc: "Bjoern A. Zeeb" <bz@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: kernel memory checks on boot vs. boot time Message-ID: <4D89DEB9.7060509@freebsd.org> In-Reply-To: <4D88FE89.1060900@feral.com> References: <alpine.BSF.2.00.1103221634241.6104@ai.fobar.qr> <201103221551.14289.jhb@freebsd.org> <4D88FE89.1060900@feral.com>
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on 22/03/2011 21:54 Matthew Jacob said the following: > John Baldwin wrote: >> >> Do other platforms bother with these sorts of memory tests? If not I'd vote >> to just drop it. I think this mattered more when you didn't have things like >> SMAP (so you had to guess at where memory ended sometimes). Also, modern >> server class x86 machines generally support ECC RAM which will trigger a >> machine check if there is a problem. I doubt that the early checks are >> catching anything even for the non-ECC case. >> >> If nothing else, I would definitely drop this from amd64 (all those systems >> have SMAP and machine check support, etc.). >> >> > Memory checks are definitely still useful. Loading the linux mem tester has > helped find lots of problems, even on so-called modern machines. I'd voter for > leaving this as an option. I think that you talk about a different kind of memory checking/testing. What we have in FreeBSD looks a lot like what BIOSes use(d) to do on startup. Besides, AFAIR, it doesn't report any results to you. -- Andriy Gapon
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