Re: stmmac: Performance regression after commit aff3d9eff843 "net: stmmac: enable multiple buffers"

Às 10:20 AM de 3/23/2017, Corentin Labbe escreveu:

On Thu, Mar 23, 2017 at 10:12:18AM +0000, Joao Pinto wrote:

quoted

Hi Corentin,

Às 10:08 AM de 3/23/2017, Corentin Labbe escreveu:

quoted

Hello

Using next-20170323 produce a huge performance regression on my sunxi boards.
On dwmac-sun8i, iperf goes from 94mbs/s to 37 when sending.

On cubieboard2(dwmac-sunxi), iperf made the kernel flood with "ndesc_get_rx_status: Oversized frame spanned multiple buffers"
and network is lost after.

Reverting aff3d9eff84399e433c4aca65a9bb236581bc082 fix the issue.
I still try to found which part of this patch mades the performance lower.

Regards
Corentin Labbe

I have a 4.21 QoS Core with 4 RX + 4 TX and detected no regression.
Could you please share the iperf cmds you are using in order for me to reproduce
in my side?

simple iperf -c serverip for both board

Ok, I am going to run my tests with a fresh net-next and come back to you soon.

Thanks,
Joao