netdev - Re: [PATCH net-next] virtio_net: do not rate limit counter increments

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Message-ID: <87r4wd9s9h.fsf@rustcorp.com.au>
Date:	Wed, 28 Mar 2012 16:33:22 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Rick Jones <rick.jones2@...com>, netdev@...r.kernel.org
Cc:	mst@...hat.com, virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH net-next] virtio_net: do not rate limit counter increments

On Tue, 27 Mar 2012 10:28:09 -0700 (PDT), raj@...dy.cup.hp.com (Rick Jones) wrote:
> From: Rick Jones <rick.jones2@...com>
> 
> While it is desirable to rate limit certain messages, it is not
> desirable to rate limit the incrementing of counters associated
> with those messages.
> 
> Signed-off-by: Rick Jones <rick.jones2@...com>

Acked-by: Rusty Russell <rusty@...tcorp.com.au>

Thanks!
Rusty.

> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 019da01..4de2760 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -625,12 +625,13 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
>  
>  	/* This can happen with OOM and indirect buffers. */
>  	if (unlikely(capacity < 0)) {
> -		if (net_ratelimit()) {
> -			if (likely(capacity == -ENOMEM)) {
> +		if (likely(capacity == -ENOMEM)) {
> +			if (net_ratelimit()) {
>  				dev_warn(&dev->dev,
>  					 "TX queue failure: out of memory\n");
>  			} else {
> -				dev->stats.tx_fifo_errors++;
> +			dev->stats.tx_fifo_errors++;
> +			if (net_ratelimit())
>  				dev_warn(&dev->dev,
>  					 "Unexpected TX queue failure: %d\n",
>  					 capacity);
> 

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