Linux <---> Unixware slow networking with e100

Linux <---> Unixware slow networking with e100

[Sven Schuster]

Hello everybody,

we have a little problem here with networking between linux
(redhat AS 2.1 2.4.9-e.27smp) and unixware 7.1.1 . The network
card is a Intel 82557 Ethernet Pro 100 (lspci output) on a 100 mbit
network. When doing data transfers between two linux machines,
everything works fine, we have transfer rates of about 10 MB/s.
But when _receiving_ data from one of the unixware machines, we
just get a few kB/s, max. about 100 kB/s. When _sending_ data to
a unixware machine, the transfer rate is fine too. Are there any
known issues between linux and unixware (except the SCO thing
;-) ) ??
At first we used the eepro100 driver, but this gave us poor
performance on receive with every other machine, whether it was
unixware or linux.

Another thing on that machine is, that there's a Intel 82544GC
copper gigabit card in it. When using this one with the e1000 driver,
it also gave us bad performance on receive (also just around max.
100 kB/s). Maxbe there are some options for module loading for
the e1000 driver??

Thanks in advance for any tips!!!



Sven

Re: Linux <---> Unixware slow networking with e100

[Rask Ingemann Lambertsen]

On Thu, Nov 06, 2003 at 08:31:33AM +0100, Sven Schuster wrote:

> But when _receiving_ data from one of the unixware machines, we
> just get a few kB/s, max. about 100 kB/s. When _sending_ data to
> a unixware machine, the transfer rate is fine too. Are there any
> known issues between linux and unixware (except the SCO thing
> ;-) ) ??

Run tcpdump and see what the window sizes are when sending data from
Unixware to Linux.

-- 
Regards,
Rask Ingemann Lambertsen

Re: Linux <---> Unixware slow networking with e100

[Sven Schuster]

Rask Ingemann Lambertsen wrote:

>On Thu, Nov 06, 2003 at 08:31:33AM +0100, Sven Schuster wrote:
>
>
>>But when _receiving_ data from one of the unixware machines, we
>>just get a few kB/s, max. about 100 kB/s. When _sending_ data to
>>a unixware machine, the transfer rate is fine too. Are there any
>>known issues between linux and unixware (except the SCO thing
>>;-) ) ??
>>
>
>Run tcpdump and see what the window sizes are when sending data from
>Unixware to Linux.
>
This actually seems to be a problem with either a switch in the network or
with the onboard intel network card. I think it's one of the  switches, or
maybe the combination of those (one Planet FN-SW102 100 Mbit and one 
Foundry
B15000 with the ports of our machines running at 100 Mbit), because we have
the same slow transfer rates in this network from unixware to unixware. 
I did
some tests yesterday directly from a redhat AS 2.1 to a unixware machine 
via
cat. 7 crossover, and I didn't have any problems. And over a Planet switch
(100 Mbit) there also were no problems.

But thanks for your tip!! I'll get back and report what the issue was 
for the
archives.

Sven