Funny network performance problem

On Tue, 2003-10-21 at 21:11, Craig White wrote:
> On Tue, 2003-10-21 at 01:03, Emmanuel Gravel wrote:
> > I recently purchased a dual-speed full-duplex switch (TrendWare brand,
> > got it relatively cheap). Decided to check the speed by transfering
> > large files (more than 100MB). Linux to Windows, I get 2.4-2.8 MB/s.
> > Windows to Linux, I get 0.8 MB/s at best. I've tried transfering only
> > from one to the other, then full duplex transfers, and I get the same
> > numbers.
> >
> > Now, to start with, 2.8MB/s is better than what I'd get at 10Mb/s but
> > it's not quite as fast as I expected it to be. But the other side of the
> > equation is pretty bad. Both cables between the computers and the switch
> > are the same, they're fully molded, factory quality, I got them when I
> > purchased my first (10Mb/s) hub. Network cards are Kingston KNE100TX on
> > the Windows system, and Intel EtherExpress 100's for the Linux system
> > (two, the Linux system is my firewall). Obviously all transfers of those
> > sizes are done on the internal IP's only, and using an FTP client on
> > Windows (push/pull).
> >
> > Does anyone know how I could trace the issue and resolve it?
> ----
> Not a specific answer to your question but...
>
> If the cables were purchased when you first purchased 10BaseT, then they
> are likely not 'Cat 5' - considering the low cost of quality Cat 5
> cables, you should probably upgrade your cables.
>
> If these aren't Cat 5 cables, I don't know how you could expect to get
> full duplex transfers.
>
> It would also be interesting to see the line in dmesg...
>
> eth0: Setting 100mbps full-duplex based on auto-negotiated partner
> ability 45e1.i
>
> Craig

This is the only relevant portion of dmesg about the network cards.
Nothing about 10/100 or full/half duplex:

eth0: Intel Corporation 82557 [Ethernet Pro 100], 00:D0:B7:1C:AE:72, I/O
at 0xa800, IRQ 5.
Board assembly 721383-008, Physical connectors present: RJ45
Primary interface chip i82555 PHY #1.
General self-test: passed.
Serial sub-system self-test: passed.
Internal registers self-test: passed.
ROM checksum self-test: passed (0x04f4518b).
eth1: Intel Corporation 82557 [Ethernet Pro 100] (#2),
00:90:27:94:E4:8C, I/O at 0xac00, IRQ 10.
Board assembly 721383-006, Physical connectors present: RJ45
Primary interface chip i82555 PHY #1.
General self-test: passed.
Serial sub-system self-test: passed.
Internal registers self-test: passed.
ROM checksum self-test: passed (0x04f4518b).