> You do not have the data required to (a) detect the problem and (b)
> recover even if you could detect the problem. The APIC bus has a
> single bit checksum, the APIC hardware detects single bit errors and
> does a retransmission. It _cannot_ detect double bit errors, the bad
> data is accepted and processed with undefined side effects.
Thanks to the way the checksum is calculated (a two-bit cumulative sum),
about 75% of double-bit errors are detected as well.
-- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +- 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/