Re: I've ran out of ideas

From: Arne (arne_woerner_at_yahoo.com)
Date: 11/19/04

  • Next message: Aaron Glenn: "Re: I've ran out of ideas" 
    Date: Thu, 18 Nov 2004 19:21:35 -0800 (PST)
To: Luke <lukem@cse.unsw.EDU.AU>

    --- Luke <lukem@cse.unsw.EDU.AU> wrote:
    > On Thu, 18 Nov 2004, Arne Wörner wrote:
    > > Hmm... Since /dev/zero delivers on my box about 100-300MByte/sec
    > > (100Mbyte/sec for 512byte block size), it looks like your network driver
    > > hinders the throughputting proceedings (I assume, that your other
    > > network devices can handle 90Mbit/sec; no ethernet collisions, no
    > > concurrency, ...). Are you sure, that Linux performs better in the same
    > > setting?
    >
    > I think you must mean Mbps, not MBps. If it were bytes, you would be
    > saturating 2.5 gigabit links with a single connection. Not to mention
    > most PCI busses.
    >
    neo# dd if=/dev/zero of=/dev/null bs=512k count=1000
    1000+0 records in
    1000+0 records out
    524288000 bytes transferred in 1.475860 secs (355242396 bytes/sec)

    I meant /dev/zero, which does not use PCI or so (it just produces zeros; that's
    why it is so fast). Just the bus between processor and main memory, I think...
    With my 133MHz FSB(?) my DDRAM can do 8Gbit/sec??? I am not so good in such
    things... Looks like each byte gets copied three times before it reaches
    /dev/null... Does somebody agree?

    Maybe my contributions are too weird and misleading, but I do not see, that
    they are technically wrong.

    -Arne

                    
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  • Next message: Aaron Glenn: "Re: I've ran out of ideas"