How many iscsi and underlying top sessions are u using? If multiple, pls check 
if all to sessions are being used.

Btw, what tuning did u perform to fix Tcp BDP issue?


Thanks 

Sent from my iPhone

On Aug 26, 2014, at 12:53 PM, "Mark Lehrer" <[email protected]> wrote:

> On Tue, 26 Aug 2014 08:58:46 -0400 Alvin Starr <[email protected]> wrote:
>> 
>>>> I am trying to achieve10Gbps in my single initiator/single target
>>>> env. (open-iscsi and IET)
>>> 
>>> On a semi-related note, are there any good guides out there to
>>> tuning Linux for maximum single-socket performance?  On my 40 gigabit
>> 
>> You are likely getting hit by the bandwidth-delay product.
>> Take a look at http://en.wikipedia.org/wiki/Bandwidth-delay_product
>> and http://www.kehlet.cx/articles/99.html
> 
> Thanks that helped get my netcat transfer up over 500MB/sec using IPoIB. 
> Unfortunately that is still only about 10% of the available bandwidth.
> 
> I'll keep on tweaking and see how far I can take it.
> 
> Thanks,
> Mark
> 
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