Re: 64bit CPUs

From: Robert Watson (rwatson_at_FreeBSD.org)
Date: 05/02/05

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    Date: Mon, 2 May 2005 04:48:12 +0100 (BST)
To: Mike Tancsa <mike@sentex.net>

    On Sun, 1 May 2005, Mike Tancsa wrote:

    > A somewhat obvious question to some perhaps, but what server application
    > mix on FreeBSD today sees an improvement using 64bit CPUs ? In my ISP
    > centric world, my big apps are BIND, IMAP/POP3, httpd via apache, SMTP,
    > AV and SPAM scanning, and firewalls/routing. Apart from larger RAM, why
    > would these benefit from the 64bit world ? Or would they ?

    RAM/address space is the big reason. In fact, applications compiled for
    64-bits may well run slower than 32-bit ones running on the 64-bit kernel.
    Note that systems like Solaris default build many programs as 32-bit,
    since there's no benefit to running ls(1) with a 64-bit address space.

    On the other hand, if you need a large memory system, running a 64-bit
    system will give you better support and utilization than a 32-bit system
    runing with PAE, at least on FreeBSD.

    Robert N M Watson
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