10 Mbit throughput on 100 Mbit infrastructure

[massheep]

i start with the facts:

client
eth0: negotiated 100baseTx-FD, link ok
product info: TDK 78Q2120 rev 10
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

server (eth0: WAN, eth1: LAN)
eth0: negotiated 100baseTx-FD, link ok
product info: vendor 00:00:00, model 0 rev 0
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

eth1: negotiated 100baseTx-FD, link ok
product info: vendor 00:00:00, model 0 rev 0
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 100baseTx-FD 10baseT-FD
link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

it doesn't matter if i download from eth0 or eth1 of the server. the speed is around 1.5 MB/s.

what could be the reason?

[Janne Pikkarainen]

With what you tried to download? What I mean that in some occasions I get VERY crappy transfer speeds with Konqueror, but if I try from exactly same computer to exactly same computer from shell with scp or any other tool, it will be fast.
_________________
Yes, I'm the man. Now it's your turn to decide if I meant "Yes, I'm the male." or "Yes, I am the Unix Manual Page.".

[massheep]

i tryed it with wget (http) and mc (nfs).

i just tryed it with mozilla and there is no change.

[neuron]

have you looked on top while copying? to see if you see extreamly high output on SI/HI for example?

You could also cat /proc/interrupts to see if ERR is high while copying. And check dmesg after copying to see if anything looks off there.

[massheep]

top
1.7 hi
8.6% si
>80% id

cat /proc/interrupts
ERR stais on 0 all the time

dmesg
shows nothing strange going on

=== addition ===
the driver is 3c590/3c900 for the two cards 3c905b and 3csoho100.

=== addition 2 ===
it is not the server but the client. i just managed to download over http on win2k at 4.5 MB/s.

is there a benchmark for nics on linux?

[nobspangle]

check the duplex setting on the switch, make sure it is on for the ports you are trying to use, duplex mismatches can cause this kind of issue.

[massheep]

everything is fd, at least what the leds and mii-tool tell.

is it possible that my 10/100 nic is just 10? it is the only thing i can imagine... (3com megahertz 574b) :-/

[Janne Pikkarainen]

Have you tried to turn auto-negotiation off and force the connection to be 100-FD? ethtool -s eth0 speed 100 duplex full autoneg off should do the trick, or mii-tool -F 100baseTx-FD, for that matter.
_________________
Yes, I'm the man. Now it's your turn to decide if I meant "Yes, I'm the male." or "Yes, I am the Unix Manual Page.".

[massheep]

instead of
eth0: negotiated 100baseTx-FD, link ok
it says
eth0: 100 Mbit, full duplex, link ok
now, but no change in speed, not even when ich change cable which was able to handle 100 Mbit.