Re: [dpdk-dev] Performance regression in DPDK 1.8/2.0

["De Lara Guarch, Pablo" <pablo.de.lara.guarch@intel.com>]

Hi Paul,

> -----Original Message-----
> From: Paul Emmerich [mailto:emmericp@net.in.tum.de]
> Sent: Tuesday, April 28, 2015 12:48 PM
> To: De Lara Guarch, Pablo
> Cc: Pavel Odintsov; dev@dpdk.org
> Subject: Re: [dpdk-dev] Performance regression in DPDK 1.8/2.0
> 
> Hi,
> 
> 
> De Lara Guarch, Pablo <pablo.de.lara.guarch@intel.com>:
> > Could you tell me which changes you made here? I see you are using
> simple tx code path on 1.8.0,
> > but with the default values, you should be using vector tx,
> > unless you have changed anything in the tx configuration.
> 
> sorry, I might have written that down wrong or read the output wrong.
> I did not modify the l2fwd example.
> 
> 
> > So, just for clarification,
> > for l2fwd you used E3-1230 v2 (Ivy Bridge), at 1.6 GHz or 3.3 GHz?
> 
> At 1.6 GHz as it is simply too fast at 3.3 GHz ;)
> 
> 
> I'll probably write a minimal example that shows my
> problem with tx only sometime next week.
> I just used the l2fwd example to illustrate my point
> with a 'builtin' example.

Thanks for the clarification. I tested it on Ivy Bridge as well, and I could not reproduce the issue.
Make sure that you use vector rx/tx anyway, to get best performance 
(you should be seeing better performance, since l2fwd in 1.8/2.0 uses both vector rx/tx).

Thanks,
Pablo

> 
> Paul