"Mark Cave-Ayland" <[EMAIL PROTECTED]> writes: > Wow, a 64-bit CRC does seem excessive, especially when going back to Zmodem > days where a 50-100k file seemed to be easily protected by a 32-bit CRC. I'm > sure there are some error rates somewhere dependent upon the polynomial and > the types of error detected.... Try the following link towards the bottom: > http://www.ee.unb.ca/tervo/ee4253/crc.htm for some theory on detection rates > vs. CRC size.
When the CRC size was decided, I recall someone arguing that it would really make a difference to have 1-in-2^64 chance of failure rather than 1-in-2^32. I was dubious about this at the time, but didn't have any evidence showing that we shouldn't go for 64. I suppose we ought to try the same example with a 32-bit CRC and see how much it helps. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])