Re: New CRC algorithm: Slicing by 8 - Mailing list pgsql-hackers

Tom Lane wrote:
>
> 
> Yah, I checked.  Several times... but if anyone else wants to repeat
> the experiment, please do.  Or look for bugs in either my test case
> or Gurjeet's.


FWIW - FreeBSD and Linux results using Tom's test program on almost 
identical hardware[1]:
            Std crc     Slice-8 crc

Intel P-III 1.26Ghz (FreeBSD 6.2)

8192 bytes  12.975314   14.503810
1024 bytes  1.633557    1.852322
64 bytes    0.111580    0.206975


Intel P-III 1.26Ghz (Gentoo 2006.1)


8192 bytes  12.967997   28.363876
1024 bytes  1.632317    3.626230
64 bytes    0.111513    0.326557


Interesting that the slice-8 algorithm seems to work noticeably better 
on FreeBSD than Linux - but still not as well as the standard one (for 
these tests anyway)...


Cheers

Mark

[1] Both  boxes have identical mobos, memory and CPUs (same sspec nos).