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Date:   Tue, 22 Feb 2022 16:55:58 -0800
From:   Jakub Kicinski <kuba@kernel.org>
To:     Oleksij Rempel <o.rempel@pengutronix.de>
Cc:     Woojung Huh <woojung.huh@microchip.com>,
        UNGLinuxDriver@microchip.com, Andrew Lunn <andrew@lunn.ch>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Vivien Didelot <vivien.didelot@gmail.com>,
        Vladimir Oltean <olteanv@gmail.com>,
        "David S. Miller" <davem@davemloft.net>, kernel@pengutronix.de,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net-next v1 1/1] net: dsa: microchip: ksz9477: reduce
 polling interval for statistics
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In-Reply-To: <20220221084129.3660124-1-o.rempel@pengutronix.de>
References: <20220221084129.3660124-1-o.rempel@pengutronix.de>
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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@pengutronix.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