Re: [RFC PATCH 0/2] net: threadable napi poll loop

[Eric Dumazet]

On Wed, May 11, 2016 at 7:38 AM, Paolo Abeni <pabeni@xxxxxxxxxx> wrote:

> Uh, we have likely the same issue in the net_rx_action() function, which
> also execute with bh disabled and check for jiffies changes even on
> single core hosts ?!?

That is why we have a loop break after netdev_budget=300 packets.
And a sysctl to eventually tune this.

Same issue for softirq handler, look at commit
34376a50fb1fa095b9d0636fa41ed2e73125f214

Your questions about this central piece of networking code are worrying.

>
> Aren't jiffies updated by the timer interrupt ? and thous even with
> bh_disabled ?!?

Exactly my point : jiffie wont be updated in your code, since you block BH.