On 4/6/21 4:49 PM, Gatis Peisenieks wrote:
> Tx queue cleanup happens in interrupt handler on same core as rx queue
> processing. Both can take considerable amount of processing in high
> packet-per-second scenarios.
>
> Sending big amounts of packets can stall the rx processing which is unfair
> and also can lead to out-of-memory condition since __dev_kfree_skb_irq
> queues the skbs for later kfree in softirq which is not allowed to happen
> with heavy load in interrupt handler.
>
[ ... ]
> diff --git a/net/core/dev.c b/net/core/dev.c
> index 0f72ff5d34ba..489ac60b530c 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -6789,6 +6789,7 @@ int dev_set_threaded(struct net_device *dev, bool
> threaded)
>
> return err;
> }
> +EXPORT_SYMBOL(dev_set_threaded);
>
> void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
> int (*poll)(struct napi_struct *, int), int weight)
This has already been done in net-next
Please base your patch on top of net-next, this can not be backported to old
versions anyway, without some amount of pain.
