netdev - Re: [PATCH net] net_sched: sch_fq: properly set sk->sk_pacing

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Date:   Thu, 26 Dec 2019 15:35:58 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com, soheil@...gle.com,
        ncardwell@...gle.com
Subject: Re: [PATCH net] net_sched: sch_fq: properly set
 sk->sk_pacing_status

From: Eric Dumazet <edumazet@...gle.com>
Date: Mon, 23 Dec 2019 11:13:24 -0800

> If fq_classify() recycles a struct fq_flow because
> a socket structure has been reallocated, we do not
> set sk->sk_pacing_status immediately, but later if the
> flow becomes detached.
> 
> This means that any flow requiring pacing (BBR, or SO_MAX_PACING_RATE)
> might fallback to TCP internal pacing, which requires a per-socket
> high resolution timer, and therefore more cpu cycles.
> 
> Fixes: 218af599fa63 ("tcp: internal implementation for pacing")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable, thanks Eric.