Re: 64bit CPUs
From: Eric Anderson (anderson_at_centtech.com)
Date: 05/02/05
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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. ------------------------------------------------------------------------ _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscribe@freebsd.org"
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