[Samba] is there a bandwidth limit per file?

Hello Everybody!

I set up a fileserver:
- Pentium II, 350 Mhz,
- 256MB RAM,
- Intel Fast Ethernet PCI
- VIA-SATA Controller
- 2x500GB SATA HDD RAID 1
- Debian 4, Samba 3
- Samba set up in user shares mode without special options, but with
the suggested optimizations

Clients:
- Windows XP Prof SP2

So far it works fine. I can read and write files without problem. But my
bandwith seems to be limited somehow. When i copy one file i get a
nearly constant transfer rate of about 6.8 MB/s (read and write).
Do i copy two files in parallel i get a total transfer rate of about
10MB/s (again for read and write)
with 3 files it is even around 11MB/s. Why i can't reach this transfer
rate with just one file? It is the same from both windows pc.

I benchmarked my network around 11.5MB/s are reached using netio
(Win-Win,Win-Debian).
The HDDs are reaching 60MB/s with hdparm -t /dev/sd?

I search for such an issue, but didn't find something useful. I looked
into the documentation, but didn't find some hints for that issue.

How can i find the bootleneck in the system?

Best reguards,
Michael

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