On Feb 6, 2012, at 7:17 PM, Shawn Pearce <spearce@xxxxxxxxxxx> wrote:
> I haven't really put a lot of thought into this. But I suspect CRC-32
> is sufficient on the index file, until it gets so big that the
> probability of a bit flip going undetected is too high due to the size
> of the file, but then we are into the "huge" index size range that has
> you trying to swap out SHA-1 for CRC-32 because SHA-1 is too slow. Uhm
> no.
CRCs are designed to be implemented in hardware and provide basic single-bit error checking for networking packets of disk blocks. With a good polynomial, they're reasonably effective at detecting a single-bit error within 8 or 16 kilobytes:
http://www.ece.cmu.edu/~koopman/networks/dsn02/dsn02_koopman.pdf
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