netdev - Re: [PATCH net-next 12/12] ibmvnic: Do not replenish RX buffers after every polling loop

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Date:   Thu, 12 Nov 2020 21:52:01 -0800
From:   drt <drt@...ux.vnet.ibm.com>
To:     Thomas Falcon <tlfalcon@...ux.ibm.com>
Cc:     netdev@...r.kernel.org, cforno12@...ux.ibm.com,
        ljp@...ux.vnet.ibm.com, ricklind@...ux.ibm.com,
        dnbanerg@...ibm.com, brking@...ux.vnet.ibm.com,
        sukadev@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org,
        Linuxppc-dev 
        <linuxppc-dev-bounces+drt=linux.vnet.ibm.com@...ts.ozlabs.org>
Subject: Re: [PATCH net-next 12/12] ibmvnic: Do not replenish RX buffers after
 every polling loop

On 2020-11-12 11:10, Thomas Falcon wrote:
> From: "Dwip N. Banerjee" <dnbanerg@...ibm.com>
> 
> Reduce the amount of time spent replenishing RX buffers by
> only doing so once available buffers has fallen under a certain
> threshold, in this case half of the total number of buffers, or
> if the polling loop exits before the packets processed is less
> than its budget.
> 
> Signed-off-by: Dwip N. Banerjee <dnbanerg@...ibm.com>

Acked-by: Dany Madden <drt@...ux.ibm.com>

> ---
>  drivers/net/ethernet/ibm/ibmvnic.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/ibm/ibmvnic.c
> b/drivers/net/ethernet/ibm/ibmvnic.c
> index 0791dbf1cba8..66f8068bee5a 100644
> --- a/drivers/net/ethernet/ibm/ibmvnic.c
> +++ b/drivers/net/ethernet/ibm/ibmvnic.c
> @@ -2476,7 +2476,10 @@ static int ibmvnic_poll(struct napi_struct
> *napi, int budget)
>  		frames_processed++;
>  	}
> 
> -	if (adapter->state != VNIC_CLOSING)
> +	if (adapter->state != VNIC_CLOSING &&
> +	    ((atomic_read(&adapter->rx_pool[scrq_num].available) <
> +	      adapter->req_rx_add_entries_per_subcrq / 2) ||
> +	      frames_processed < budget))
>  		replenish_rx_pool(adapter, &adapter->rx_pool[scrq_num]);
>  	if (frames_processed < budget) {
>  		if (napi_complete_done(napi, frames_processed)) {