netdev - Re: [PATCH net-next v1 1/1] net: dsa: microchip: ksz9477: reduce polling interval for statistics

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Message-ID: <20220222165558.0a43b2ee@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 22 Feb 2022 16:55:58 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>, kernel@...gutronix.de,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v1 1/1] net: dsa: microchip: ksz9477: reduce
 polling interval for statistics

On Mon, 21 Feb 2022 09:41:29 +0100 Oleksij Rempel wrote:
> 30 seconds is too long interval especially if it used with ip -s l.
> Reduce polling interval to 5 sec.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> ---
>  drivers/net/dsa/microchip/ksz_common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
> index 27cae9f04322..0531aa671574 100644
> --- a/drivers/net/dsa/microchip/ksz_common.c
> +++ b/drivers/net/dsa/microchip/ksz_common.c
> @@ -453,7 +453,7 @@ int ksz_switch_register(struct ksz_device *dev,
>  	}
>  
>  	/* Read MIB counters every 30 seconds to avoid overflow. */
> -	dev->mib_read_interval = msecs_to_jiffies(30000);
> +	dev->mib_read_interval = msecs_to_jiffies(5000);
>  
>  	/* Start the MIB timer. */
>  	schedule_delayed_work(&dev->mib_read, 0);

Seems reasonable, although who knows how slow the buses get.
In case we need to make it configurable in the future there's already
uAPI for it - stats_block_coalesce_usecs