John,
Given you made this sound like a controlled test as you are
troubleshooting a problem, normally its assumed that the tests are being
done in a controlled state with replicated like for like as close as
possible, specially with tcp tuning and non of the below would be
applicable.
if you re randomly running a test and emailing a list asking for help,
then yes, you are correct... it is very possible
On 2014-11-21, 12:49 PM, John Neiberger wrote:
Actually, it's quite possible to have 400 in one direction and 60 in
the other. As an example, if you assume a 1 Gbps link with 20ms RTT, a
receiver using a 1 MB receive window might see between 300-400 Mbps,
whereas a receiver stuck with a 64 KB receive window on the same link
might see only 20 Mbps. It's pretty common, especially if one side is
an older OS.
John
On Fri, Nov 21, 2014 at 10:46 AM, Payam Chychi <[email protected]
<mailto:[email protected]>> wrote:
Hi Johan,
This sounds like a network issue, i'm actually dealing with the
same thing with one of my off-net providers.
Latency does of course play a factor however, latency has a
bidirectional influence and not asymmetric (as in 200ms rtr both
ways).
No reason as to why you should be getting 400 one way and 60 the
other.
Only thing comes to mind is different paths the packets may
travel, hitting a congestion/problem point.
You should grant your provider a maintenance window to take down
your circuit and do an end to end throughput test and make sure
they provide you with the results.
If they can get 1:1 capacity then look at your optics, interfaces,
any bundled links, and switch/routing fabric at both ends.
Cheers
Payam
On 2014-11-19, 1:18 PM, Johan Borch wrote:
Hi!
I'm doing some performance troubleshooting between two linux
systems, the
servers are located in each end of an L3VPN, with a bunch of
routers
between them.
Using Iperf and UDP I get ~1Gbps in both directions
Using iperf and TCP i get ~400Mbps in one direction and
~60Mbps in the
other direction
Could this still be a network problem or should I dig on the
linux side?
Johan
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