-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 David Hendricks wrote: > On Wed, Jun 24, 2009 at 12:30 AM, David Hendricks <[email protected]>wrote: > >> On Tue, Jun 23, 2009 at 2:28 AM, Alois Schlögl >> <[email protected]>wrote: >> >>> The reason for asking is the bug as described here: >>> http://bugzilla.kernel.org/show_bug.cgi?id=13573 >>> >>> The bug is affecting my research at the university. >>> It was suggested that a Bios-update could solve the problem. >> >> IIRC you can disable thermal throttling, but it's usually not a good idea >> if you expect to keep your machine running with reasonable performance under >> load. If the vendor BIOS had the proper tables (See section 2.4.2 on >> P-States in the AMD BIOS and Kernel Developer's Guide for Fam10 processors), >> your CPU would slow itself down to avoid generating too much heat. If you >> disable thermal throttling and continue to run your workload, your CPU will >> hit "Tjunction" at around 116 degrees C and shut itself off abruptly, >> possibly after physical damage has been done to the CPU or the socket. >> >> I would suggest starting with something much simpler, like making sure you >> have quality thermal transfer compound applied in the proper quantity for >> your CPUs. I know it sounds stupid, but I have seen many machines from many >> datacenters with very powerful rack cooling overheat under heavy loads due >> to improperly applied thermal grease. There are many tutorials and videos on >> how to do this. Make sure you clean off the old thermal grease first with a >> high-concentration isopropyl alcohol (>90%) first. >> > > Oh, and while you're at it make sure the heatsinks are securely fastened. > After you re-apply thermal grease, tighten the screws such that they will > not turn any more. The mounting points on the motherboard will ensure the > maximum threshold is not exceeded, though I suggest tightening one about > 80-90%, then the second one 100%, then finish the first one to apply the > pressure more evenly. > > Just another very silly thing that can cause unexpected behavior under heavy > workloads... >
Thanks for these hints. That sound very reasonable to me. If understood you correctly, the shutdown occurs because the current bios is missing the _PSS table. Update the bios would resolve this, and re-apply thermal grease, would throttle the CPU later or not at all. In order to update the bios, I tried followed also this approach http://ubuntuforums.org/showthread.php?p=2195208 as well as this http://manual.sidux.com/en/bios-freedos-en.htm The final test showed that my USB-stick is bootable. Unfortunately, the system never boots from USB. I changed 1st, 2nd and 3rd boot device to USB-floppy, USB-ZIP, USB-CDROM and turned off HDD, no boot device was found. I guess this is another problem of the current bios. Therefore, coreboot would be really appreciated. Carl-Daniel Hailfinger wrote: > Judging from experience, the legal review happens faster if we can show > more (or more interesting) reference customers, so if you plan to use > coreboot on 780G/SB700 as part of university research, we'd tell AMD > about this immediately. > Carl, you can tell AMD, that I'm working on some numerical methods that can efficiently handle missing values (encoded as NaN) http://hci.tugraz.at/schloegl/matlab/NaN/ http://hci.tugraz.at/schloegl/matlab/tsa/ These methods are quite useful in various applications of biomedical signal processing (like electroencephalography) http://biosig.sourceforge.net/ http://hci.tugraz.at/schloegl/ These methods could be useful for Brain-Computer interface research, and for a better understanding of the human brain. Perhaps, the methods will be also useful in other application areas. Best regards, Alois -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkpCGuAACgkQzSlbmAlvEIjr/gCgk/7ovF3c2PGAvvbBiot5rkOV E7oAoMBkIfExZAZ51QgOkqzxDdXmAXlI =C2g+ -----END PGP SIGNATURE----- -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
