Re: 50Mb across the country in 6 seconds

Sorry I meant RTT and window size not MSS. TCP throughput in bits per
second can be calculated as window size in bits / RTT in milliseconds

You always have to take latency into the equation and it makes a huge
difference as latency goes up. TCP window scaling can help
dramatically but make sure you do not have unrealistic expectations.
Maximum theoretical tcp throughput as you see here is a function of
RTT and window size not link speed.

On 3/3/12, Joe Astorino <joeastorino1982_at_gmail.com> wrote:
> You can't forget to take into account the L4 transport mechanism. TCP
> will obviously have some impact on the speed because of the
> acknowlegement nature of the protocol.
>
> Ultimately your throughput calculation will have to consider RTT and
> MSS if you are dealing with TCP
>
>
>
> On 3/3/12, Jersey Guy <guy.jersey_at_gmail.com> wrote:
>> Hello Gents. This DBA guy tells me he copied a 50Mb file from his machine
>> in New Jersey to a server in California in 6 seconds. I told him that's
>> not
>> possible because the smallest link in the path is 1Gb/sec but MTU is
>> 1500,
>> so even if you take wire speed, it would be at least 33 seconds before
>> the
>> file was copied. Am I wrong in saying so?
>>
>> TIA
>>
>>
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>
> --
> Sent from my mobile device
>
> Regards,
>
> Joe Astorino
> CCIE #24347
> http://astorinonetworks.com
>
> "He not busy being born is busy dying" - Dylan
>

-- 
Sent from my mobile device
Regards,
Joe Astorino
CCIE #24347
http://astorinonetworks.com
"He not busy being born is busy dying" - Dylan
Blogs and organic groups at http://www.ccie.net