Re: I've ran out of ideas

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

  • Next message: Bryan Fullerton: "Re: I've ran out of ideas" 
    Date: Thu, 18 Nov 2004 18:23:48 -0800 (PST)
To: freebsd-performance@freebsd.org

    Ooopps... My last email has somehow the wrong content... Sorry.

    --- Aaron Glenn <aaron.glenn@gmail.com> wrote:
    > On Thu, 18 Nov 2004 10:31:55 -0800 (PST), Arne Wörner
    > <arne_woerner@yahoo.com> wrote:
    > > Hmm... So the hard disc driver delivers data quite quickly...
    > >
    > > Maybe you could try a read from /dev/zero via ftp (by logging in as a user
    > > via ftp)? Then we would see, how fast your network driver + card is (e. g.
    > > if you use "wget" there is a speed meter on the right)...
    >
    > ftp> get /dev/zero
    [...]
    > 73784040 bytes received in 00:11 (5.86 MB/s)
    >
    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?

    Furthermore I saw on my box, that indeed a block size of 2KByte slows "dd..."
    down to 10MByte/sec (which is just 25% of the "maximum").

    Maybe the handshaking of TCP causes some slow down?

    Did you try "ping -c 10 -s 60000 <other host>" where <other host> denotes
    another host?

    Now I do not have any further ideas, but I am interested in the ping-results...

    -Arne

                    
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  • Next message: Bryan Fullerton: "Re: I've ran out of ideas"