] Help understanding results from a single TCP
session
You were getting more bandwidth than expected because Linux (and other OSes)
will automatically increase the TCP window size. Google for
tcp_moderate_rcvbuf, for example. One way to actually get the window sizes
you expect is to use the -w
You were getting more bandwidth than expected because Linux (and other
OSes) will automatically increase the TCP window size. Google
for tcp_moderate_rcvbuf, for example. One way to actually get the window
sizes you expect is to use the -w argument to iperf. Note that linux will
double what you
ng the
>>> results that I did. I would have expected to get 1.265Mbps with the test
>>> setup the way I described.
>>>
>>> ** **
>>>
>>> I would like to understand how I was getting 65Mbps+ on that 160ms RTT
>>> link with those default window size
gt;> ** **
>>
>> Cheers,
>>
>> ** **
>> ----------
>>
>> *From:* Mohammad Hajjat [mailto:haj...@purdue.edu]
>> *Sent:* Monday, 14 October 2013 11:00 AM
>> *To:* Nik Koracek
>> *Cc:* Mohammad Hajjat; iperf-users
&
gt;
> Cheers,
>
> ** **
> --
>
> *From:* Mohammad Hajjat [mailto:haj...@purdue.edu]
> *Sent:* Monday, 14 October 2013 11:00 AM
> *To:* Nik Koracek
> *Cc:* Mohammad Hajjat; iperf-users
>
> *Subject:* Re: [Iperf-users] Help unde
: Nik Koracek
Cc: Mohammad Hajjat; iperf-users
Subject: Re: [Iperf-users] Help understanding results from a single TCP
session
I see, why can't you just increase iperf's window size?
I had experiments where I had to set the window size in iperf to 16 MB to
get an optimal bandwidth.
rdue.edu]
> *Sent:* Monday, 14 October 2013 12:18 AM
> *To:* nkora...@tpg.com.au
> *Cc:* iperf-users
> *Subject:* Re: [Iperf-users] Help understanding results from a single TCP
> session
>
> ** **
>
> But your server's window size isn't 25 KB, is it?
>
understanding results from a single TCP
session
But your server's window size isn't 25 KB, is it?
Also, what is it in specific that you want to explain? I'm sorry I lost
track :P
On Sun, Oct 13, 2013 at 7:46 AM, wrote:
Hi All,
I was troubleshooting a throughput issue
But your server's window size isn't 25 KB, is it?
Also, what is it in specific that you want to explain? I'm sorry I lost
track :P
On Sun, Oct 13, 2013 at 7:46 AM, wrote:
> Hi All,
>
> ** **
>
> I was troubleshooting a throughput issue recently on an international
> 300Mbps link which had
Hi All,
I was troubleshooting a throughput issue recently on an international
300Mbps link which had a RTT of ~160ms.
I have copied the output below from testing a single TCP session between two
linux servers at either endpoint.
I have the output from two tests from the perspective of
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