Hi Chris,
(Re-send of an earlier post for which i got a bounce message, i'm sorry if you received it twice) ----- Original Message ----- > There is no advantage to 64bit on this box unless forward-looking binary > compatibility is on your list. Some Linux distros are only coming in 64bit > flavors now. > > The pointers are twice as long, 64bit applications tend to be larger, use > more > memory, and have more data to move around so 64bit mode can actually be > slower. > There are features to potentially make 64bit mode faster like the extra > registers but the automatic register remapping happens in 32bit mode, too. > I've heard arguments like that before, but the results in the PDF i sent earlier disagree. Because i didn't have a full 64bit userspace right then i repeated the rest. However, a lot of things changed since i have a normal Gentoo installation running now. Everything is now compiled 64bit with atom optimalisations, while the liveDVD of course included generic 32bit kernels and userspace. To avoid sending the PDF again these are results: Test 1, 1 process: 1100 MB/s Test 1, 2 processes: 445 MB/s and 445 MB/s Test 1, 3 processes: 229 MB/s, 287 MB/s and 308 MB/s Test 2, 1 process: 3700 KB/s Test 2, 2 processes: 2000 KB/s and 2000 KB/s Test 2, 3 processes: 1300 KB/s, 1300 KB/s and 1300 KB/s Test 3, 1 process: 52.837s Test 3, 2 processes: 71,273s and 71,42s Test 3, 3 processes: 115,186s, 116,903s and 117,245s For test 1 especially the test with one process has better results than ealier 64 bit test. For test 2 all results are significantly higher than all measurements i did before. For test 3 the tests with one or two processes got a nice speedup, the one with 3 processes is too close to call it a difference. I expect the results for test 2 to be a result of kernel improvements and atom optimalisation (there's no HWRNG as far as i know). The setup for test 3 has changed most since my ealier tests where with 32 bit only and that is now 64 bit. Of course there's more difference than 32- or 64bit, but with these results i'll stick with 64bit :-) Of course the gain is not very high, but i think it's a good thing to get the most out of these not-so-powerful boxes :-) Best regards, Wesley _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
