netdev - Re: [PATCHv2] netem: Segment GSO packets on enqueue.

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Date:	Thu, 28 Apr 2016 13:58:53 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	netdev@...r.kernel.org, Jamal Hadi Salim <jhs@...atatu.com>,
	"David S. Miller" <davem@...emloft.net>,
	netem@...ts.linux-foundation.org
Subject: Re: [PATCHv2] netem: Segment GSO packets on enqueue.

On Thu, 2016-04-28 at 16:09 -0400, Neil Horman wrote:
> This was recently reported to me, and reproduced on the latest net kernel, when
> attempting to run netperf from a host that had a netem qdisc attached to the
> egress interface:

>  
> -	return NET_XMIT_SUCCESS;
> +finish_segs:
> +	while (segs) {
> +		skb2 = segs->next;
> +		segs->next = NULL;
> +		qdisc_skb_cb(segs)->pkt_len = segs->len;
> +		rc = qdisc_enqueue(segs, sch);
> +		if (rc != NET_XMIT_SUCCESS) {
> +			if (net_xmit_drop_count(rc))
> +				qdisc_qstats_drop(sch);
> +		}
> +		segs = skb2;
> +	}
> +	return rc;
>  }

It seems you missed the qdisc_tree_reduce_backlog() call ?