Re: 64bit CPUs

From: Eric Anderson (anderson_at_centtech.com)
Date: 05/02/05

  • Next message: kama: "Re: Very low disk performance on 5.x"
    Date: Mon, 02 May 2005 07:44:54 -0500
    To: Mariusz Grad <mariusz.grad@pwr.wroc.pl>
    
    

    Mariusz Grad wrote:
    > Mike Tancsa:
    >
    >>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 ?
    >
    > Benefits from AMD64:
    > - larger RAM limit (40bit memory address),
    > - 64bit GRPs,
    > - much faster access to memory (memory controller inside core - no northbridge),
    > - it much better scales (with many CPUs) (he doesnt share memory bandwith),
    > - large caches L1 = 64KB, L2 = 1MB (comparing to xeon 12/512K),

    Some Xeon's have 2MB now..

    > - DEP = Data Execution Protection (it has to be supported via OS),

    Intel has the 'NX' (no execute) bit - isn't this the same?

    > - Multimedia Extensions for graphics / vector processing.

    Xeon's have this too I believe (I don't think this is anything new either).

    > = Opterons remove memory bottlenecks espacially with multi-cpus.
    >
    > Ive had large acceleration at:
    > - math computation (f77, 2-4GB double precision matrix) single opteron 1.8GHz (sun v20z) was 4x faster then celeron 2.4GHz.
    > - databases (pgsql) Opteron 1.8 GHz 2x faster then Xeon 3.2

    That's interesting, although I wouldn't compare a Celeron against an
    AMD64, but interesting nonetheless.

    > I would assume that everything which can run:
    > - in parallel,
    > - on multi-Opterons CPU,
    > - which uses heavly RAM,
    > - which can take benefits from 64bit registers (floating points),
    > will have _extreamly_ boost comparing to Intels EMT64 (or Itanium2).

    Agreed..

    Eric

    -- 
    ------------------------------------------------------------------------
    Eric Anderson        Sr. Systems Administrator        Centaur Technology
    A lost ounce of gold may be found, a lost moment of time never.
    ------------------------------------------------------------------------
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  • Next message: kama: "Re: Very low disk performance on 5.x"

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