[dpdk-dev] Performance regression in DPDK 1.8/2.0
De Lara Guarch, Pablo
pablo.de.lara.guarch at intel.com
Tue May 5 16:56:56 CEST 2015
Hi Paul,
> -----Original Message-----
> From: Paul Emmerich [mailto:emmericp at net.in.tum.de]
> Sent: Tuesday, April 28, 2015 12:48 PM
> To: De Lara Guarch, Pablo
> Cc: Pavel Odintsov; dev at dpdk.org
> Subject: Re: [dpdk-dev] Performance regression in DPDK 1.8/2.0
>
> Hi,
>
>
> De Lara Guarch, Pablo <pablo.de.lara.guarch at 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
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