Network transfer via FTP in bursts

Hi,

I'm running a Redhat 9 server on an AMD64 Thunderbird 1.1.GHz/256 MB RAM/40GB UDMA WD HDD/Realtek 8139 full duplex 10/100Mb/sec network card. The only service running on it is FTP (ProFTPD).

My problem is that FTP traffic is made in "bursts" (see photo of Network graph monitor below)
http://www.masster.ro/test/FTP.jpg

What should I change/tweak in hardware/configuration?

Thanks

Your graph doesn't show what the time interval for that traffic was...between peaks...how much time are you talking about there? milliseconds? seconds? minutes? Could you have a graph that shows what the X-Y axis are ?

Thanks.

On X: some 3 seconds transfer, some 3 seconds pause.
On Y: peaks are up to 1.2 MBytes/sec.