On 05/06/10 02:57, Vlamsdoem wrote:
> On 05/05/10 15:12, Phil Stracchino wrote:
>> On 05/05/10 08:38, John Drescher wrote:
>>    
>>>> Sorry my servers are on gigabit links.
>>>> How do you come to 9MB/s with a 100Mb link, is it not equals to 12,5 MB/s?
>>>>        
>>> Overhead.
>>>
>>>      
>>>> If it's correct on a gigabit link I would have a rate transfer of 90MB/s
>>>>        
>>> You will probably get less than that if you do not use jumbo frames.
>>>
>>>      
> I did an throughput test with iperf between 2 servers on a gigabit link 
> and it results in a 940Mb/s transfer rate .
> You tell me that transfer rate will be less than 90MB/s, is there so 
> much overhead in the application layer?

It really varies.  I routinely get 95Mbit real-world throughput across
my 100Mbit network; I know other people using different hardware or
different configurations who've never seen 90Mbit.  Gigabit is the same
way.  If you're getting 940Mbit throughput you're doing well, but
remember that actual application throughput may not hit that.


-- 
  Phil Stracchino, CDK#2     DoD#299792458     ICBM: 43.5607, -71.355
  alaric AT caerllewys DOT net   alaric AT metrocast DOT net   phil AT 
co.ordinate DOT org
         Renaissance Man, Unix ronin, Perl hacker, Free Stater
                 It's not the years, it's the mileage.

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