Date: Mon, 2 May 2005 14:16:33 +0200 From: Mariusz Grad <mariusz.grad@pwr.wroc.pl> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-performance@freebsd.org Subject: Re: 64bit CPUs Message-ID: <20050502121633.GA14896@wask.wask.wroc.pl> In-Reply-To: <6.2.1.2.0.20050501094429.06974910@64.7.153.2> References: <6.2.1.2.0.20050501094429.06974910@64.7.153.2>
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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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