RE: [SLUG] Poor Gb network performance

["Raphael Kraus" <rkraus@xxxxxxxxxxxxx>]

Hrmm... Have thought about the cables - may be worth a shot as the
cabinet is so tight, but it is a long shot...

Aah... A Nvidia "softnic" is on-board both of the machines, and a PCI
Realtek. On Debian the Nvidia is eth0 and Realtek eth1 and vice versa on
the Ubuntu.

Not sure on any control utilities - been a while since I've examined nic
drivers (or any other drivers for that matter). I'll check it out.
(Refernces welcome :)

Thanks heaps for all your help!


Regards,
 
Raphael Kraus
Software Developer
rkraus@xxxxxxxxxxxxx
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-----Original Message-----
From: slug-bounces@xxxxxxxxxxx [mailto:slug-bounces@xxxxxxxxxxx] On
Behalf Of Jeff Waugh
Sent: Tuesday, 29 August 2006 4:45 PM
To: Raphael Kraus
Cc: slug@xxxxxxxxxxx
Subject: Re: [SLUG] Poor Gb network performance

<quote who="Raphael Kraus">

>         Speed: 1000Mb/s
>         Duplex: Full

> [   22.910730] eth0: forcedeth.c: subsystem: 01043:8141 bound to

- 8< - snip - 8< -

> eth0: Identified chip type is 'RTL8169s/8110s'.
> eth0: RTL8169 at 0xf89ca000, 00:0f:b5:8d:59:ad, IRQ 201
> eth0: Auto-negotiation Enabled.
> eth0: 1000Mbps Full-duplex operation.

So you've got an Nvidia "softnic" (rather like a softmodem, so kind of
icky if you're looking for performance) and a Realtek, which are not
widely known for their performance. I'm not sure that explains the full
extent of your performance problems, but it's a start.

Are there any control utilities or module parameters for forcedeth?
Perhaps you could switch it between performance modes (to favour CPU or
throughput, pick your poison).

Long shot: Make sure you have a good cable.

- Jeff

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