Date: Wed, 26 Jul 2017 21:43:10 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 219399] System panics after several hours of 14-threads-compilation orgies using poudriere on AMD Ryzen... Message-ID: <bug-219399-8-VlXPe85bnF@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-219399-8@https.bugs.freebsd.org/bugzilla/> References: <bug-219399-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D219399 --- Comment #168 from Mark Millard <markmi@dsl-only.net> --- (In reply to Don Lewis from comment #163) Table 73 ("Memory Device (Type 17) structure") of: http://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.1.1.p= df (System Management BIOS (SMBIOS) Reference Specification) reports: Total width, in bits, of this memory device, including any check or error-correction bits. If there are no error-correction bits, this value should be equal to Data Width. If the width is unknown, the field is set to FFFFh. Also: Data width, in bits, of this memory device. A Data Width of 0 and a Total Width of 8 indicates that the device is being used solely to provide 8 error-correction bits. If the width is unknown, the field is set to FFFFh. (It is indicates as applying to specification versions: 2.1+ .) So for the 128 in: Memory Device . . . Error Information Handle: 0x002D Total Width: 128 bits Data Width: 64 bits Total Width !=3D Data Width is supposed to imply error correction bits but I doubt that many. It seems odd and is probably not according to the specification. So it is not clear that the ECC status can be inferred. The factor of 2 between 64 and 128 is more likely from something like dual-channel or some such with any error correction bits ignored if present/in-use. This tends to suggest that interpreting the dmidecode output for such things can be a problem to rely on. --=20 You are receiving this mail because: You are the assignee for the bug.=
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