100Mbit/s LAN slow, TX only ~3MB/s (esp. file transfer) -- why?

[Wojciech Puchar]

> Thank you all who took time to reply! The problem really seems to be one
> of the (or maybe even both, even the LinkSys!) NICs in the FreeBSD machines.
> No wonder, the RealTek card is a cheap piece of crap (around EUR 6), I
> am going to replace it with something more reliable. Any recommendations?
>
> Is there a card with Really Good(TM) driver implementation for FreeBSD?
> Anything one would use in a production server (we use 3com cards almost
> exclusively at work, although mostly in Linux servers)?

once i've got cheap cards (20PLN=about 4 EUR) and bought 20 of them but i 
used only in NetBSD. but it seems fast (no problem to do 9MB/s on pentium 
166 NFS)

got detected like that
tlp0 at pci0 dev 8 function 0: ADMtek AN985 Ethernet, pass 1.1
tlp0: interrupting at irq 9
tlp0: Ethernet address 00:0a:cd:05:46:e2
ukphy0 at tlp0 phy 1: Generic IEEE 802.3u media interface
ukphy0: OUI 0x000749, model 0x0001, rev. 1
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto


but it regularly gives
tlp0: receive error: CRC error
tlp0: receive error: CRC error
tlp0: receive error: CRC error

while except polluting logs it doesn't harm speed. i don't know if it's 
switch, NetBSD or something else

this is good too (even better) but no more is available for now where i 
buy.

sip0 at pci0 dev 8 function 0: NatSemi DP83815 10/100 Ethernet, rev 00
sip0: interrupting at irq 12
sip0: Ethernet address 00:50:fc:62:24:a6
nsphyter0 at sip0 phy 0: DP83815 10/100 media interface, rev. 1
nsphyter0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto