netdev - RE: [EXT] Re: [PATCH v2 RESEND 1/1] net: fec: add xdp and page pool statistics

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Date:   Mon, 14 Nov 2022 15:01:46 +0000
From:   Shenwei Wang <shenwei.wang@....com>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>,
        Andrew Lunn <andrew@...n.ch>
CC:     Paolo Abeni <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "imx@...ts.linux.dev" <imx@...ts.linux.dev>
Subject: RE: [EXT] Re: [PATCH v2 RESEND 1/1] net: fec: add xdp and page pool
 statistics



> -----Original Message-----
> From: Alexander Lobakin <alexandr.lobakin@...el.com>
> Sent: Monday, November 14, 2022 7:57 AM
> To: Andrew Lunn <andrew@...n.ch>
> Cc: Alexander Lobakin <alexandr.lobakin@...el.com>; Shenwei Wang
> <shenwei.wang@....com>; Paolo Abeni <pabeni@...hat.com>; David S. Miller
> <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub
> Kicinski <kuba@...nel.org>; Alexei Starovoitov <ast@...nel.org>; Daniel
> Borkmann <daniel@...earbox.net>; Jesper Dangaard Brouer
> <hawk@...nel.org>; John Fastabend <john.fastabend@...il.com>;
> netdev@...r.kernel.org; linux-kernel@...r.kernel.org; imx@...ts.linux.dev
> Subject: [EXT] Re: [PATCH v2 RESEND 1/1] net: fec: add xdp and page pool
> statistics
> 
> Caution: EXT Email
> 
> From: Andrew Lunn <andrew@...n.ch>
> Date: Mon, 14 Nov 2022 14:50:54 +0100
> 
> > >    What is your machine and how fast your link is?
> >
> > Some FEC implementations are Fast Ethernet. Others are 1G.
> >
> > I expect Shenwei is testing on a fast 64 bit machine with 1G, but
> > there are slow 32bit machines with Fast ethernet or 1G.
> 
> Okay. I can say I have link speed on 1G on MIPS32, even on those which are 1-
> core 600 MHz. And when I was adding more driver stats, all based on
> u64_stats_t, I couldn't spot any visible regression.
> 100-150 Kbps maybe?
> 

I did implement a quick version of u64_stats_t counters, and the performance impact
was about 1~3Mbps on the i.MX8QXP which is 1.2GHz ARM64 Dual Core platform, which
is about 1.5% performance decrease.

Regards,
Shenwei

> >
> >      Andrew
> 
> Thanks,
> Olek