DragonFly BSD
DragonFly kernel List (threaded) for 2003-11
[Date Prev][Date Next]  [Thread Prev][Thread Next]  [Date Index][Thread Index]

Re: AMD64 impressions (Re: AMD64 box)

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>
Date: Wed, 12 Nov 2003 14:12:43 -0800 (PST)

:If you think an Athlon64 is fast, you should get a Tyan Tiger K8S or
:Asus SK8N and an Athlon FX51.  The dual-channel memory controller of
:the Opteron/FX51 vs. Athlon64 gives a very noticable speedup.

    I saw that chip but decided that the money was better spent on the
    lower end chip for the UP work because I eventually plan on getting
    another box (i.e. an SMP box).

    I'm impressed either way, though.  The Athlon64 will interleave the
    banks and when I write a little program to scan, say, a 32MB chunk of
    memory over and over again I get on the order of 2.62GBytes/sec from
    main memory with PC3200 memory. 

					Matthew Dillon 

:>     (2) The AMD's syscall overhead is very low compared to the P4.
:>         I ran the 'sc1' test in /usr/src/test/sysperf.  The AMD box
:>         comes back at 242nS/loop while the P4 takes 1300nS/loop and
:>         the DELL box (LEAF/SMP) takes 617nS/loop.
:We worked on the overall performance of the chip in real-world situations.
:Not just paying attention only to those things that raised the MHz and
:game FPS benchmarks.
:-- David    (obrien@xxxxxxxx)

[Date Prev][Date Next]  [Thread Prev][Thread Next]  [Date Index][Thread Index]