ndt-users list created

[Byron Hicks <>]

I'm having this same issue.  I'm using pstoolkit 3.2.2, NDT 3.6.4, on
servers with Myri10GE interfaces.

NDT and bwctl using iperf get very different answers:

NDT:

[root@ps1-akard-dlls
 init.d]# web100clt -n ps1-hardy-hstn
Testing network path for configuration and performance problems  --
Using IPv4 address
Checking for Middleboxes . . . . . . . . . . . . . . . . . .  Done
checking for firewalls . . . . . . . . . . . . . . . . . . .  Done
running 10s outbound test (client to server) . . . . .  8251.97 Mb/s
running 10s inbound test (server to client) . . . . . . 1349.95 Mb/s
sending meta information to server . . . . . Done
The slowest link in the end-to-end path is a 10 Gbps 10 Gigabit
Ethernet/OC-192 subnet
Information: Other network traffic is congesting the link
Information [S2C]: Packet queuing detected: 83.58% (remote buffers)
Server 'ps1-hardy-hstn' is not behind a firewall. [Connection to the
ephemeral port was successful]
Client is not behind a firewall. [Connection to the ephemeral port was
successful]
Packet size is preserved End-to-End
Server IP addresses are preserved End-to-End
Client IP addresses are preserved End-to-End

BWCTL/IPERF:

[root@ps1-akard-dlls
 init.d]# bwctl -f g -s ps1-hardy-hstn
bwctl: Using tool: iperf
bwctl: 15 seconds until test results available

RECEIVER START
bwctl: exec_line: iperf -B 74.200.187.90 -s -f g -m -p 5058 -t 10
bwctl: start_tool: 3577554914.806607
------------------------------------------------------------
Server listening on TCP port 5058
Binding to local address 74.200.187.90
TCP window size: 0.00 GByte (default)
------------------------------------------------------------
[ 15] local 74.200.187.90 port 5058 connected with 74.200.187.98 port 5058
[ ID] Interval       Transfer     Bandwidth
[ 15]  0.0-10.0 sec  10.9 GBytes  9.34 Gbits/sec
[ 15] MSS size 8948 bytes (MTU 8988 bytes, unknown interface)
bwctl: stop_exec: 3577554928.880958

RECEIVER END

[root@ps1-akard-dlls
 init.d]# bwctl -f g -c ps1-hardy-hstn
bwctl: Using tool: iperf
bwctl: 15 seconds until test results available

RECEIVER START
bwctl: exec_line: iperf -B 74.200.187.98 -s -f g -m -p 5022 -t 10
bwctl: start_tool: 3577554939.532031
------------------------------------------------------------
Server listening on TCP port 5022
Binding to local address 74.200.187.98
TCP window size: 0.00 GByte (default)
------------------------------------------------------------
[ 14] local 74.200.187.98 port 5022 connected with 74.200.187.90 port 5022
[ ID] Interval       Transfer     Bandwidth
[ 14]  0.0-10.0 sec  10.6 GBytes  9.09 Gbits/sec
[ 14] MSS size 8948 bytes (MTU 8988 bytes, unknown interface)
bwctl: stop_exec: 3577554952.353805

RECEIVER END

Any ideas why they would be so different?

On 01/30/2013 10:02 PM, Matt Mathis wrote:
> Try the c client to see if the problem is at the client or server end.
> 
> Thanks,
> --MM--
> The best way to predict the future is to create it.  - Alan Kay
> 
> Privacy matters!  We know from recent events that people are using our
> services to speak in defiance of unjust governments.   We treat privacy
> and security as matters of life and death, because for some users, they are.
> 
> 
> On Wed, Jan 30, 2013 at 10:12 AM, Nat Stoddard 
> <
> <mailto:>>
>  wrote:
> 
> 
>     Dear members:
> 
>     I thought I would try again to find an answer to this since I
>     noticed recent messages related to NDT on 10 gig devices:
> 
>     I have tried several approaches to use NDT on a server with a 10 gigabit
>     interface.  I wonder if there are any limitations on the server to
>     client
>     tests using either web100clt or the Java client.  I have not been
>     able to get more than around 2.6 gigs
>     server-to-client.  The client-to-server test can go over 9 gigs even
>     without
>     extensive tuning.  On the same server, I can get over 9 gigs in each
>     direction
>     to a neighbor server using iperf tests.
> 
>     Are there any tips on running NDT on a 10gig capable server?
> 
>     Thanks,
>     Nat Stoddard
> 
> 


-- 
Byron Hicks
Lonestar Education and Research Network
office: 972-883-4645
google: 972-746-2549
aim/skype: byronhicks


-- 
Byron Hicks
Lonestar Education and Research Network
office: 972-883-4645
google: 972-746-2549
aim/skype: byronhicks



-- 
Byron Hicks
Lonestar Education and Research Network
office: 972-883-4645
google: 972-746-2549
aim/skype: byronhicks




-- 
Byron Hicks
Lonestar Education and Research Network
office: 972-883-4645
google: 972-746-2549
aim/skype: byronhicks