I've ran out of ideas

Arne Wörner arne_woerner at yahoo.com
Thu Nov 18 18:23:49 PST 2004

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

--- Aaron Glenn <aaron.glenn at gmail.com> wrote:
> On Thu, 18 Nov 2004 10:31:55 -0800 (PST), Arne Wörner
> <arne_woerner at 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...


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