Messages in this thread | | | Subject | Re: [STATUS 2.5] October 30, 2002 | From | Alan Cox <> | Date | 01 Nov 2002 16:49:48 +0000 |
| |
On Fri, 2002-11-01 at 14:05, Eric W. Biederman wrote: > When you have a correctable ECC error on a page you need to rewrite the > memory to remove the error. This prevents the correctable error from becoming > an uncorrectable error if another bit goes bad. Also if you have a > working software memory scrub routine you can be certain multiple > errors from the same address are actually distinct. As opposed to > multiple reports of the same error.
Note that this area has some extremely "interesting" properties. For one you have to be very careful what operation you use to scrub and its platform specific. On x86 for example you want to do something like lock addl $0, mem. A simple read/write isnt safe because if the memory area is a DMA target your read then write just corrupted data and made the problem worse not better!
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |