netdev - Re: Kernel 4.19 network performance - forwarding/routing normal users traffic

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Date:   Sat, 10 Nov 2018 22:01:31 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Paweł Staszewski <pstaszewski@...are.pl>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        brouer@...hat.com
Subject: Re: Kernel 4.19 network performance - forwarding/routing normal
 users traffic

On Sat, 10 Nov 2018 21:02:10 +0100
Paweł Staszewski <pstaszewski@...are.pl> wrote:

> W dniu 10.11.2018 o 20:34, Jesper Dangaard Brouer pisze:
> > I want you to experiment with:
> >
> >   ethtool --set-priv-flags DEVICE rx_striding_rq off  
>
> just checked that previously connectx4 was have thos disabled:
>   ethtool --show-priv-flags enp175s0f0
>
> Private flags for enp175s0f0:
> rx_cqe_moder       : on
> tx_cqe_moder       : off
> rx_cqe_compress    : off
> rx_striding_rq     : off
> rx_no_csum_complete: off
> 

The CX4 hardware does not have this feature (p.s. the CX4-Lx does).

 
> So now we are on connectx5 and we have enabled - for sure connectx5 
> changed cpu load - where i have now max 50/60% cpu where with connectx4 
> there was sometimes near 100% with same configuration.

I (strongly) believe the CPU load was related to the page-alloactor
lock congestion, that Aaron fixed.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer