netdev - Re: [PATCH net-next] net: introduce SO_MAX_PACING

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Date:	Fri, 27 Sep 2013 17:28:14 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Steinar H. Gunderson" <sesse@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Michael Kerrisk <mtk.manpages@...il.com>
Subject: Re: [PATCH net-next] net: introduce SO_MAX_PACING_RATE

On Fri, 2013-09-27 at 23:16 +0200, Steinar H. Gunderson wrote:
> On Mon, Sep 23, 2013 at 08:10:14AM -0700, Eric Dumazet wrote:
> > SO_MAX_PACING_RATE offers the application the ability to cap the
> > rate computed by transport layer. Value is in bytes per second.
> 
> I tried this (the first version) on top of 3.12-rc2, but it doesn't actually
> appear to work.
> 
> The setsockopt goes through:
> 
>   [pid 30501] setsockopt(11, SOL_SOCKET, 0x2f /* SO_??? */, [1920000], 4) = 0
> 
> And the fq scheduler is active on the machine:

The socket option actually works, but FQ has a problem with non TSO
frames, because default quantum is 3028 (2 * 1514)

I am testing this patch :

diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c
index 32ad015..f7e45b0 100644
--- a/net/sched/sch_fq.c
+++ b/net/sched/sch_fq.c
@@ -473,7 +473,8 @@ begin:
 
 		rate = min(rate, q->flow_max_rate);
 		if (rate) {
-			u64 len = (u64)qdisc_pkt_len(skb) * NSEC_PER_SEC;
+			u32 plen = max(qdisc_pkt_len(skb), q->quantum);
+			u64 len = (u64)plen * NSEC_PER_SEC;
 
 			do_div(len, rate);
 			/* Since socket rate can change later,





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