Thanks for the suggestions. I tested mTCP ftpsrv again *) with these
values:
MTU 1472
FTPSRV_FILEBUFFER_SIZE 16
FTPSRV_TCPBUFFER_SIZE 16
FTPSRV_PACKETS_PER_POLL 2 **)
Now look at the results!
Upload from Mac to DOS server
real machine virtualbox
EZ-NOS 2 75 sec. 4 sec.
Datalight Sockets 61 sec. 4 sec.
WATT32 ftpsrv32 21 sec. 11 sec.
mTCP ftpsrv 15 sec. 2 sec.
SwsSock ftpd 32 sec. 4 sec.
PCTCP ftpsrv 60 sec. 4 sec.
Download from DOS server to Mac
real machine virtualbox
EZ-NOS 2 154 sec. 135 sec.
Datalight Sockets 70 sec. 4 sec.
WATT32 ftpsrv32 31 sec. 2 sec.
mTCP ftpsrv 15 sec. 1 sec.
SwsSock ftpd 94 sec. 77 sec.
PCTCP ftpsrv 187 sec. 7 sec.
I think the numbers speak for themselves. mTCP ftpsrv seems to be the
fastest DOS FTP server ever.
regards
Ulrich
*) To mention it again, the test was done by copying a 8934148 bytes
big mp3 file. Client was Filezilla 3.5.1 on a MacBook Pro 2011 with OS
X 10.6.8. As servers I used a FreeDOS 1.0 installation in VirtualBox
4.1.4 (32 MB RAM) and a real machine (Compaq Contura Aero 4/33 20MB RAM).
**) The value "FTPSRV_PACKETS_PER_POLL 10" you suggested slowed down
the uploads to mTCP in virtualbox (7 sec. instead of 2 sec.). In
detail the upload started, but shortly after the start paused for 3 or
4 sec. With the value 2 there was no such delay.
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