Network Connection Slooooooow

[Jeffrae]

Hello,

I am running SUSE SLES 8 PPC on an IBM iSeries. Has anyone else here
experianced poor network performance? IT is not just SAMBA or Apache..
etc.. etc.. It is across the whole board..
I do use a virtual ethernet connections upplied by IBM.. This might be the
problem, but I am guessing not. The linux server did not always have a slow
connection..


Any Ideas?

Thanks,
Jeff P

[Jeffrae]

Post by Jeffrae
Hello,
I am running SUSE SLES 8 PPC on an IBM iSeries. Has anyone else here
experianced poor network performance? IT is not just SAMBA or Apache..
etc.. etc.. It is across the whole board..
I do use a virtual ethernet connections upplied by IBM.. This might be the
problem, but I am guessing not. The linux server did not always have a slow
connection..
Any Ideas?
Thanks,
Jeff P

I forgot to add..

Even transfering files to the iSeries from the linux machine is slow and
this is not even done over the cat6 network.. This is handled internally..


The iSeries is really fast when I access the files on its IFS..

Wierd

[Jeffrae]

Post by Jeffrae

Post by Jeffrae
Hello,
I am running SUSE SLES 8 PPC on an IBM iSeries. Has anyone else here
experianced poor network performance? IT is not just SAMBA or Apache..
etc.. etc.. It is across the whole board..
I do use a virtual ethernet connections upplied by IBM.. This might be

the

Post by Jeffrae
problem, but I am guessing not. The linux server did not always have a

slow

Post by Jeffrae
connection..
Any Ideas?
Thanks,
Jeff P

I forgot to add..
Even transfering files to the iSeries from the linux machine is slow and
this is not even done over the cat6 network.. This is handled internally..
The iSeries is really fast when I access the files on its IFS..
Wierd

I think this is my culprit.. The ethernet line that the linux machine is using is set for half duplex.. Our switches are full.. I am going to change this and see if it makes much of a difference.. Do you think have them mixed would have caused a very slow connection?

Jeff P

Display Line Description

Line description . . . . . . . . . : ETHLIN830
Option . . . . . . . . . . . . . . : *BASIC
Category of line . . . . . . . . . : *ELAN

Resource name . . . . . . . . . . : CMN08
Online at IPL . . . . . . . . . . : *YES
Vary on wait . . . . . . . . . . . : *NOWAIT
Network controller . . . . . . . . : ETHLINET00
Local adapter address . . . . . . : 00096BB3006C
Exchange identifier . . . . . . . : 056BCBF0
Ethernet standard . . . . . . . . : *ALL
Line speed . . . . . . . . . . . . : 100M
Current line speed . . . . . . . . : 100M
Duplex . . . . . . . . . . . . . . : *HALF
Current duplex . . . . . . . . . . : *HALF
Maximum frame size . . . . . . . . : 1496
Maximum controllers . . . . . . . : 40

[Doug McLaren]

In article <cpcpp0$1l8s$***@newsfeed.norlight.net>,
Jeffrae <***@alynk.com> wrote:

| I think this is my culprit.. The ethernet line that the linux
| machine is using is set for half duplex.. Our switches are full..
| I am going to change this and see if it makes much of a difference..
| Do you think have them mixed would have caused a very slow
| connection?

Yes, I've seen that cause extremely slow ethernet connections, over
and over and over. Rather than 10 MB/s, you'll see 50 KB/s transfer
rates.

But everything does work, so it's not noticed right away ...

I've seen this over and over and over, on many different architectures
of machines. So many times that when somebody says `slow local
network' it's the first thing I check.

[Jeffrae]

Post by Doug McLaren
| I think this is my culprit.. The ethernet line that the linux
| machine is using is set for half duplex.. Our switches are full..
| I am going to change this and see if it makes much of a difference..
| Do you think have them mixed would have caused a very slow
| connection?
Yes, I've seen that cause extremely slow ethernet connections, over
and over and over. Rather than 10 MB/s, you'll see 50 KB/s transfer
rates.
But everything does work, so it's not noticed right away ...
I've seen this over and over and over, on many different architectures
of machines. So many times that when somebody says `slow local
network' it's the first thing I check.
--
When you're swimming in the sea, and an eel bites your knee, that's a-moray!

The weird thing is that My VETH (Virtual Ethernet) appears to be slowd down
from this too even though it is 1G Full Duplex Both Ends. (AS400 - Linux)

[Doug McLaren]

In article <cpv91e$1scj$***@newsfeed.norlight.net>,
Jeffrae <***@alynk.com> wrote:

| > | machine is using is set for half duplex.. Our switches are full..
| > | I am going to change this and see if it makes much of a difference..
| > | Do you think have them mixed would have caused a very slow
| > | connection?
| >
| > Yes, I've seen that cause extremely slow ethernet connections, over
| > and over and over. Rather than 10 MB/s, you'll see 50 KB/s transfer
| > rates.
...
| The weird thing is that My VETH (Virtual Ethernet) appears to be slowd down
| from this too even though it is 1G Full Duplex Both Ends. (AS400 - Linux)

That's exactly how it happens -- the computer's network cards are set
at full duplex, but the switch or hub is set to half duplex (often
because it cannot do full duplex.) Or vice versa.

The fix is to force the computers to do half duplex. Even if you
think the hub can do full duplex, try forcing the computers to half
duplex.

I don't know how the virtual ethernet fits into all this ...