better performance with 32 bit ! why?

Eivind Olsen eivind at
Wed Jun 29 13:37:42 UTC 2011

Issam Harrathi wrote:

> on server1(64 bit) i have 2 Intel E5310 quad-core 1.6Ghz and on server2(32
> bit) i have 2 Intel Xeon dual-core 2.33Ghz.
> means 8*1.6 Ghz on server1 and 4*2.33 on server2.
> 8*1.6 is better and faster than 4*2.33, no?

You can only do maths like that if you assume that everything is
multithreaded _and_ capable of spreading to multiple cores without any

I've mentioned earlier that for example BIND only scales up to about 4
threads. Based on this, your maths example would be (kind of simplified):

64 bit vs 32 bit:
4*1.6GHz vs 4*2.33GHz

Also, you mentioned using tcpreplay, which is also apparantly
single-threaded , making the comparison like this:

1*1.6GHz vs 1*2.33GHz.

Eivind Olsen

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