[c-nsp] Centos upload speed slower on 1000m than 100m over WAN links

Mon Jun 28 02:34:34 EDT 2010

I remember having bad times in the far past with intel NIC's on RedHat 7 that used the e100 driver, back then we've just solved those problems by using only 3com NICs that worked natively fine with linux.
I'd think nowadays those problems were over! I guess not...
Anyway, this is getting too off-topic, since it has nothing to do with Cisco devices.
Trying a different NIC, vanilla kernels or a different linux distro is definitely the way to go.
Ziv

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of bas
Sent: Sunday, June 27, 2010 4:59 PM
To: Paul
Cc: Gert Doering; cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Centos upload speed slower on 1000m than 100m over WAN links

Hi,

On Sun, Jun 27, 2010 at 11:20 AM, Paul <paul at gtcomm.net> wrote:
> Yeah I tried that.. I really think it's a problem with the linux kernel and
> e1000e driver and possibly either limited to that or an
> incompatibility with cisco switch but I doubt that since i get such good
> speeds locally.

We've had a lot of problems with this issue.
transatlantic speeds were faster on FE than on GE.
Local speeds were great.

It is indeed a bug in the kernel driver.

After an upgrade to latest vanilla the problems are gone.
Im not sure if anyone has created a rpm for a fix.

Bas
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