[dpdk-dev] [PATCH v3] i40e: workaround for X710 performance issues

[Zhang, Helin]

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com]
> Sent: Tuesday, December 16, 2014 4:37 PM
> To: Zhang, Helin
> Cc: dev at dpdk.org; Rowden, Aaron F; Chen, Jing D
> Subject: Re: [dpdk-dev] [PATCH v3] i40e: workaround for X710 performance
> issues
> 
> Hi Helin,
> 
> First, thank you and Jing for the excellent review process.
> 
> 2014-12-16 16:23, Helin Zhang:
> > On X710, performance number is far from the expectation on recent
> > firmware versions. The fix for this issue may not be integrated in the
> > following firmware version. So the workaround in software driver is
> > needed. It needs to modify the initial values of 3 internal only
> > registers. Note that the workaround can be removed when it is fixed in
> > firmware in the future.
> 
> I want to understand something here. You say the workaround can be removed
> when firmware will be fixed. But I suppose that some NICs won't be updated so
> the workaround will be needed forever?
Yes, it is possible. Let me check with our NIC marketing guys of their firmware update strategy before removing it.
Now it is quite useful for high performance. Thank you very much for pointing out this!

Regards,
Helin

> 
> --
> Thomas