Date: Tue, 22 Mar 2011 12:54:49 -0700 From: Matthew Jacob <mj@feral.com> To: John Baldwin <jhb@freebsd.org> Cc: "Bjoern A. Zeeb" <bz@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: kernel memory checks on boot vs. boot time Message-ID: <4D88FE89.1060900@feral.com> In-Reply-To: <201103221551.14289.jhb@freebsd.org> References: <alpine.BSF.2.00.1103221634241.6104@ai.fobar.qr> <201103221551.14289.jhb@freebsd.org>
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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.
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