From: Jiri Pirko <jiri@resnulli.us>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: netdev@vger.kernel.org, davem@davemloft.net, edumazet@google.com,
jhs@mojatatu.com, kuznet@ms2.inr.ac.ru, j.vimal@gmail.com
Subject: Re: [patch net-next v5 10/11] tbf: take into account gso skbs
Date: Fri, 22 Mar 2013 11:02:05 +0100 [thread overview]
Message-ID: <20130322100205.GA1593@minipsycho.orion> (raw)
In-Reply-To: <20130308152338.GA1520@minipsycho.orion>
Fri, Mar 08, 2013 at 04:23:38PM CET, jiri@resnulli.us wrote:
>Tue, Feb 19, 2013 at 06:01:27PM CET, eric.dumazet@gmail.com wrote:
>>On Tue, 2013-02-19 at 17:46 +0100, Jiri Pirko wrote:
>>
>>> About the gso_segment, do you see any cons doing that on enqueue path
>>> rather than dequeue?
>>>
>>
>>It would be fine, and could be done in core stack instead of qdisc.
>>
>
>So you mean for example in tcp code? the maximum possible size would be
>propagated from set qdiscs up to the tcp code?
>
>I'm not sure how exactly do that.
>
>>netif_skb_features() for example has the following (incomplete) check
>>
>>if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
>> features &= ~NETIF_F_GSO_MASK;
>
>Why this is incomplete?
>
>>
>>We do have a dev->gso_max_size, but its currently used in TCP stack to
>>size the skbs built in tcp_sendmsg().
>
>Where exactly in tcp_sendmsg() this is? I found dev->gso_max_size is copied to
>sk_gso_max_size in tcp_v4_connect->sk_setup_caps.
>
>>
>>In a forwarding workload, it seems we dont use/check gso_max_size.
>
>Yep, that would require to do the segmentation in enqueue anyway. Maybe
>I can implement segmentation in enqueue path first and provide tcp
>optimalization after that. What do you think?
Reminding myself with this...
Thanks.
Jiri
next prev parent reply other threads:[~2013-03-22 10:02 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-12 10:11 [patch net-next v5 00/11] couple of net/sched fixes+improvements Jiri Pirko
2013-02-12 10:11 ` [patch net-next v5 01/11] htb: use PSCHED_TICKS2NS() Jiri Pirko
2013-02-13 0:00 ` David Miller
2013-02-12 10:12 ` [patch net-next v5 02/11] htb: fix values in opt dump Jiri Pirko
2013-02-12 23:51 ` David Miller
2013-02-12 10:12 ` [patch net-next v5 03/11] htb: remove pointless first initialization of buffer and cbuffer Jiri Pirko
2013-02-13 0:00 ` David Miller
2013-02-12 10:12 ` [patch net-next v5 04/11] htb: initialize cl->tokens and cl->ctokens correctly Jiri Pirko
2013-02-13 0:00 ` David Miller
2013-02-12 10:12 ` [patch net-next v5 05/11] sch: make htb_rate_cfg and functions around that generic Jiri Pirko
2013-02-13 0:00 ` David Miller
2013-02-12 10:12 ` [patch net-next v5 06/11] sch_api: introduce qdisc_watchdog_schedule_ns() Jiri Pirko
2013-02-12 16:32 ` Eric Dumazet
2013-02-13 0:00 ` David Miller
2013-02-12 10:12 ` [patch net-next v5 07/11] tbf: improved accuracy at high rates Jiri Pirko
2013-02-12 16:34 ` Eric Dumazet
2013-02-13 0:01 ` David Miller
2013-02-12 10:12 ` [patch net-next v5 08/11] act_police: move struct tcf_police to act_police.c Jiri Pirko
2013-02-12 12:08 ` Jamal Hadi Salim
2013-02-12 16:34 ` Eric Dumazet
2013-02-13 0:01 ` David Miller
2013-02-12 10:12 ` [patch net-next v5 09/11] act_police: improved accuracy at high rates Jiri Pirko
2013-02-12 13:31 ` Jamal Hadi Salim
2013-02-12 13:39 ` Jiri Pirko
2013-02-13 0:01 ` David Miller
2013-02-12 10:12 ` [patch net-next v5 10/11] tbf: take into account gso skbs Jiri Pirko
2013-02-12 16:39 ` Eric Dumazet
2013-02-12 17:31 ` Jiri Pirko
2013-02-12 17:54 ` Eric Dumazet
2013-02-17 16:18 ` Jiri Pirko
2013-02-17 17:54 ` Eric Dumazet
2013-02-18 9:58 ` Jiri Pirko
2013-02-19 16:15 ` Eric Dumazet
2013-02-19 16:46 ` Jiri Pirko
2013-02-19 17:01 ` Eric Dumazet
2013-03-08 15:23 ` Jiri Pirko
2013-03-22 10:02 ` Jiri Pirko [this message]
2013-02-12 10:12 ` [patch net-next v5 11/11] act_police: remove <=mtu check for " Jiri Pirko
2013-02-12 16:40 ` Eric Dumazet
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