On Tue, Jun 28, 2011 at 7:32 AM, Ryan Novosielski <novos...@umdnj.edu> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 06/28/2011 12:30 PM, David Sparro wrote: >> On 6/28/2011 11:15 AM, iharrathi....@orange-ftgroup.com wrote: >>> Hi all, >>> I'm testing the same version of bind 9.4-ESV-R4-P1 on two server, one is >>> a 32 bit (on which i have a redhat 32 bit) and the second a 64 bit >>> server on which i have a redhat 64 bit. >>> on the 32 bit i reach 70000 qps but on the 64 bit i only reach 50000 qps >>> (using resperf) and also with tcpreplay. >>> Is it normal that bind when compiled and installed on a 32 bit server >>> have better performance than bind when compiled and installed on a 64 >>> bit server. >>> the only différence between the two server is 64 bit vs 32 bit ( same >>> RAM, same Disk, same NIC,...) and CPU is better on the 64 bit (2 Intel >>> E5310 quad-core 1.6Ghz) than the 32 bit(2 Intel Xeon duad-core 2.33Ghz). >>> Thanks. >>> >> >> The 32 bit rig is faster (2.33Ghz). > > My understanding is that 64-bit is NOT faster in most cases, and only > makes some things possible (addressing large amounts of memory is one > stand-out) that are not possible with 32-bit. If bind is not going to be > using over 4GB of RAM by itself, my understanding is that running 64-bit > will merely add overhead. I realize that is a pretty big generalization, > so feel free to correct me if you know better.
I'll take it a step farther. In my experience running code in 64-bit mode is USUALLY slightly slower than running it in 32-bit mode on the same hardware. This is mostly because of the added data that must be moved for 64-bit operations. It also means the 64-bit binaries are larger, often by a significant amount. I recommend sticking with 32-bit systems unless you have a specific need for 64-bit capacity. -- R. Kevin Oberman, Network Engineer - Retired E-mail: kob6...@gmail.com _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
