Re: 64bit CPUs

From: Mariusz Grad (mariusz.grad_at_pwr.wroc.pl)
Date: 05/02/05

  • Next message: Eric Anderson: "Re: Very low disk performance on 5.x" 
    Date: Mon, 2 May 2005 14:16:33 +0200
To: Mike Tancsa <mike@sentex.net>

    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),
    - DEP = Data Execution Protection (it has to be supported via OS),
    - Multimedia Extensions for graphics / vector processing.
    = 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

    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). 

    -- 
Mariusz Grad / UNIX Systems Administrator
tel: +4871 320-2520 mobile: +48 501-134-008
Wroclaw Centre for Networking and Supercomputing 
address: Wybrzeze Wyspianskiego 27, Wroclaw, Poland
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  • Next message: Eric Anderson: "Re: Very low disk performance on 5.x"

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