On Tue, 2015-02-10 at 15:19 +0100, Johannes Berg wrote:
> On Tue, 2015-02-10 at 11:33 +0100, Michal Kazior wrote:
>
> > + if (msdu->sk) {
> > + ewma_add(&ar->tx_delay_us,
> > + ktime_to_ns(ktime_sub(ktime_get(), skb_cb->stamp)) /
> > + NSEC_PER_USEC);
> > +
> > + ACCESS_ONCE(msdu->sk->sk_tx_completion_delay_cushion) =
> > + (ewma_read(&ar->tx_delay_us) *
> > + msdu->sk->sk_pacing_rate) >> 20;
> > + }
>
> To some extent, every wifi driver is going to have this problem. Perhaps
> we should do this in mac80211?
I'll provide the TCP patch.
sk->sk_tx_completion_delay_cushion is probably a wrong name, as the
units here are in bytes, since it is really number of bytes in the
network driver that accommodate for tx completions delays.
tx_completion_delay * pacing_rate
sk_tx_completion_cushion maybe.
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