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.
I did some further testing and turned off all the checksum, segment
offloads, frag offloads, etc that i could in the driver and it
gave me a much better but very unstable ranging 2-8MB/s. It almost
looks like it has a packet ordering issue, but only happens on 1000m, and
if that is the case this is the wrong forum to post on about that. And
over a local link, the latency is so fast that it's not noticable, but
once the latency
gets to 20-30ms and above it becomes worse. Best guess so far.
Arie Vayner (avayner) wrote:
Paul,
Gert's test should help us to see if there is any policing being done on
the WAN link.
The problem I am aiming at is not due to not enough BW, but due to
dropping bursts due to policing (or not enough buffers, as Gert is
referring).
Another test to do, just to make sure this problem is coming from the
WAN side, is to keep the server on the original access switch (not the
6500) and place your test client on the 6500. Can you please try that as
well?
Tnx
Arie
-----Original Message-----
From: Gert Doering [mailto:[email protected]]
Sent: Sunday, June 27, 2010 12:06
To: Paul
Cc: Arie Vayner (avayner); [email protected]
Subject: Re: [c-nsp] Centos upload speed slower on 1000m than 100m over
WAN links
Hi,
On Sun, Jun 27, 2010 at 04:55:20AM -0400, Paul wrote:
Oh and to verify some things i used iperf and send big batch of udp
traffic at 500mbit/s and it made it with 0.004% packet loss so the
bandwidth through to the external link isn't the problem either..
Can you go up to 1gbit/s on the Level3 link? If they do some sort of
policing, that would look like "a switch with small buffers".
gert
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