Re: Bad memory
On Thu, 17 Jan 2013 10:01:41 -0800 Chuck Forsberg WA7KGX N2469R c...@omen.com wrote: Option 2 has already been tried. The old motherboard was checked with memtest86+ before being placed in service running omen.com. Maybe use an out of box solution: https://www.youtube.com/watch?v=1IomAerbV7g -- Regards, Frank Ask not what Fedora can do for you, but what you can do for Fedora --me, courtesy JFK -- test mailing list test@lists.fedoraproject.org To unsubscribe: https://admin.fedoraproject.org/mailman/listinfo/test
Re: Bad memory
On Thu, Jan 17, 2013 at 09:18:40AM -0800, Chuck Forsberg WA7KGX N2469R wrote: Recently I discovered the motherboard that had been running omen.com had an undetected bad memory chip. This is a real confidence builder. Currently, running a definitive memory test requires hours of down time. The user mode memory tester has serious limitations. I propose kernel support for a user mode program similar to memtest86 to allow such a program to request a hardware block of memory and relocate whatever was in that block to another memory area. This way all of the memory can be checked in the background of a running system. There are a lof of reasons that this isn't feasible on a running system. You just don't have access to all of the memory for a full check. Justin -- test mailing list test@lists.fedoraproject.org To unsubscribe: https://admin.fedoraproject.org/mailman/listinfo/test
Re: Bad memory
2013/1/18 Justin M. Forbes jmfor...@linuxtx.org On Thu, Jan 17, 2013 at 09:18:40AM -0800, Chuck Forsberg WA7KGX N2469R wrote: Recently I discovered the motherboard that had been running omen.com had an undetected bad memory chip. This is a real confidence builder. Currently, running a definitive memory test requires hours of down time. The user mode memory tester has serious limitations. I propose kernel support for a user mode program similar to memtest86 to allow such a program to request a hardware block of memory and relocate whatever was in that block to another memory area. This way all of the memory can be checked in the background of a running system. There are a lof of reasons that this isn't feasible on a running system. You just don't have access to all of the memory for a full check. Justin why not? is there something that can not be relocated in RAM? on the other hand, wasn't there supposed to be a way to exclude a damaged RAM area by passing some arguments to the kernel? -- test mailing list test@lists.fedoraproject.org To unsubscribe: https://admin.fedoraproject.org/mailman/listinfo/test
Re: Bad memory
2013/1/18 Adam Jackson a...@redhat.com On Fri, 2013-01-18 at 20:49 +0200, cornel panceac wrote: 2013/1/18 Justin M. Forbes jmfor...@linuxtx.org There are a lof of reasons that this isn't feasible on a running system. You just don't have access to all of the memory for a full check. Justin why not? is there something that can not be relocated in RAM? The kernel image itself. DMA buffers. Memory made inaccessible by PCI BARs being in the way. Probably some other stuff I'm forgetting. Even if you fixed all that you'd still be Heisenberg-uncertain because you'd no longer be the only thing exerting cache pressure. on the other hand, wasn't there supposed to be a way to exclude a damaged RAM area by passing some arguments to the kernel? See linux/Documentation/bad_memory.txt - ajax ok, thank you very much, ajax. -- test mailing list test@lists.fedoraproject.org To unsubscribe: https://admin.fedoraproject.org/mailman/listinfo/test
Re: Bad memory
On Thu, 17 Jan 2013 09:18:40 -0800 Chuck Forsberg WA7KGX N2469R c...@omen.com wrote: Recently I discovered the motherboard that had been running omen.com had an undetected bad memory chip. This is a real confidence builder. Currently, running a definitive memory test requires hours of down time. The user mode memory tester has serious limitations. Option 2, but a stick of ram. Less fannying about. -- Regards, Frank Byte my kernel --me . -- test mailing list test@lists.fedoraproject.org To unsubscribe: https://admin.fedoraproject.org/mailman/listinfo/test
