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Re: Server to Client results for 10 gigabit very slow


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  • From: Aaron Brown <>
  • To: Dave Leibfritz <>
  • Cc: "<>" <>
  • Subject: Re: Server to Client results for 10 gigabit very slow
  • Date: Thu, 22 Aug 2013 12:26:36 +0000
  • Accept-language: en-US

Excellent, glad it worked.

Cheers,
Aaron

On Aug 21, 2013, at 5:31 PM, Dave Leibfritz
<>
wrote:

> Yes that worked! Thanks for the help.
>
> On 08/21/2013 03:57 PM, Aaron Brown wrote:
>> Hey Dave,
>>
>> I've got some RPMs available if you'd like to test. There are x86-64 EL6
>> ones at http://ndb1.internet2.edu/~aaron/ndt-3.6.5.2-rc4.x86_64/ and
>> i386 EL5 ones at http://ndb1.internet2.edu/~aaron/ndt-3.6.5.2-rc4.i386/ .
>>
>> One thing to keep in mind is that web browsers and the java environment
>> may cache the old version of the java Applet (for reasons that aren't
>> remotely clear to me) so if you get the same results, try using a
>> different computer that hasn't run the applet yet (or clear out caches).
>>
>> Cheers,
>> Aaron
>>
>> On Aug 21, 2013, at 11:34 AM, Dave Leibfritz
>> <
>> <mailto:>>
>> wrote:
>>
>>> Does anyone know where the updated version is?
>>>
>>> On 08/13/2013 08:24 PM, Richard Carlson wrote:
>>>> Hi Dave;
>>>>
>>>> We found a bug in the code recently where the S2C byte counter was set
>>>> to an 32 bit int value. At 10 Gbps rates this overflows with the
>>>> obvious results.
>>>>
>>>> The latest version is fixed. Somebody at Internet2 can tell you what
>>>> the updated version is.
>>>>
>>>> Rich
>>>>
>>>> On 08/13/2013 12:44 PM, David Leibfritz wrote:
>>>>> When running NDT tests for 10 gigabit connections the client-to-server
>>>>> results
>>>>> are what we expect, 5+ gigabit/s, but the server-to-client is less
>>>>> than 1
>>>>> gigabit/s. Can you explain why or how we resolve this. Running NDT
>>>>> tests for
>>>>> 1 gigabit/s connections are consistent in both directions. Below is an
>>>>> example or our 10 gigabit NDT tests:
>>>>>
>>>>> running 10s outbound test (client-to-server [C2S]) ..... 5709.95Mb/s
>>>>> running 10s inbound test (server-to-client [S2C]) ...... 898.46Mb/s
>>>>>
>>>>> The slowest link in the end-to-end path is a 10 Gbps 10 Gigabit
>>>>> Ethernet/OC-192 subnet
>>>>>
>>>
>>> --
>>>
>>> ----------------------------------------------------------------------
>>> David W. Leibfritz Phone: (630) 252-9276
>>> Accelerator Engineering Support Division Email:
>>>
>>> <mailto:>
>>> Argonne National Laboratory Fax: (630) 252-6123
>>> 9700 South Cass Ave. Location: 401-C2244
>>> Argonne, IL 60439-4844
>>>
>>
>
> --
>
> ----------------------------------------------------------------------
> David W. Leibfritz Phone: (630) 252-9276
> Accelerator Engineering Support Division Email:
>
> Argonne National Laboratory Fax: (630) 252-6123
> 9700 South Cass Ave. Location: 401-C2244
> Argonne, IL 60439-4844
>





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