From: John Fastabend <john.fastabend@gmail.com>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>,
David Miller <davem@davemloft.net>,
netdev@vger.kernel.org, therbert@google.com,
hannes@stressinduktion.org, fw@strlen.de, dborkman@redhat.com,
jhs@mojatatu.com, alexander.duyck@gmail.com,
john.r.fastabend@intel.com, dave.taht@gmail.com, toke@toke.dk
Subject: Re: Quota in __qdisc_run()
Date: Wed, 08 Oct 2014 10:38:45 -0700 [thread overview]
Message-ID: <543576A5.3070403@gmail.com> (raw)
In-Reply-To: <1412686038.11091.111.camel@edumazet-glaptop2.roam.corp.google.com>
On 10/07/2014 05:47 AM, Eric Dumazet wrote:
> On Tue, 2014-10-07 at 09:34 +0200, Jesper Dangaard Brouer wrote:
>> On Fri, 03 Oct 2014 16:30:44 -0700 Eric Dumazet <eric.dumazet@gmail.com> wrote:
>>
>>> Another problem we need to address is the quota in __qdisc_run()
>>> is no longer meaningfull, if each qdisc_restart() can pump many packets.
>>
>> I fully agree. My earlier "magic" packet limit was covering/pampering
>> over this issue.
>
> Although quota was multiplied by 7 or 8 in worst case ?
>
>>
>>> An idea would be to use the bstats (or cpu_qstats if applicable)
>>
>> Please elaborate some more, as I don't completely follow (feel free to
>> show with a patch ;-)).
>>
>
> I was hoping John could finish the percpu stats before I do that.
What stats are you referring to? I assume the remaining stats in the
xmit path mostly in sch_generic.c? By the way I need to do another
review of the classifier code paths but I believe we could drop the
ingress qdisc lock now (finally)...
Also some clean up in sch_generic.c could help this. Notes for
myself mostly,
dev_requeue_skb() can be a void its return value is always 0
the users of handle_dev_cpu_collision and sch_direct_xmit
don't use the qlen for anything returning any positive
integer looks like it would work.
Thanks,
John
--
John Fastabend Intel Corporation
next prev parent reply other threads:[~2014-10-08 17:39 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-01 20:35 [net-next PATCH V6 0/2] qdisc: bulk dequeue support Jesper Dangaard Brouer
2014-10-01 20:35 ` [net-next PATCH V6 1/2] qdisc: bulk dequeue support for qdiscs with TCQ_F_ONETXQUEUE Jesper Dangaard Brouer
2014-10-01 20:36 ` [net-next PATCH V6 2/2] qdisc: dequeue bulking also pickup GSO/TSO packets Jesper Dangaard Brouer
2014-10-02 14:35 ` Eric Dumazet
2014-10-02 14:38 ` Daniel Borkmann
2014-10-02 14:42 ` [net-next PATCH V6 0/2] qdisc: bulk dequeue support Tom Herbert
2014-10-02 15:04 ` Eric Dumazet
2014-10-02 15:24 ` [PATCH net-next] mlx4: add a new xmit_more counter Eric Dumazet
2014-10-05 0:04 ` David Miller
2014-10-02 15:27 ` [net-next PATCH V6 0/2] qdisc: bulk dequeue support Tom Herbert
2014-10-02 16:52 ` Florian Westphal
2014-10-02 17:32 ` Eric Dumazet
2014-10-02 17:35 ` Tom Herbert
2014-10-03 19:38 ` David Miller
2014-10-03 20:57 ` Eric Dumazet
2014-10-03 21:56 ` David Miller
2014-10-03 21:57 ` Eric Dumazet
2014-10-03 22:15 ` Eric Dumazet
2014-10-03 22:19 ` Tom Herbert
2014-10-03 22:56 ` Eric Dumazet
2014-10-03 22:30 ` David Miller
2014-10-03 22:31 ` [PATCH net-next] qdisc: validate skb without holding lock Eric Dumazet
2014-10-03 22:36 ` David Miller
2014-10-03 23:30 ` Eric Dumazet
2014-10-07 7:34 ` Quota in __qdisc_run() (was: qdisc: validate skb without holding lock) Jesper Dangaard Brouer
2014-10-07 12:47 ` Eric Dumazet
2014-10-07 13:30 ` Jesper Dangaard Brouer
2014-10-07 14:43 ` Hannes Frederic Sowa
2014-10-07 15:01 ` Eric Dumazet
2014-10-07 15:06 ` Eric Dumazet
2014-10-07 17:19 ` Quota in __qdisc_run() David Miller
2014-10-07 17:32 ` Eric Dumazet
2014-10-07 18:37 ` Jesper Dangaard Brouer
2014-10-07 20:07 ` Jesper Dangaard Brouer
2014-10-07 18:03 ` Jesper Dangaard Brouer
2014-10-07 19:10 ` Eric Dumazet
2014-10-07 19:34 ` Jesper Dangaard Brouer
2014-10-07 15:26 ` Quota in __qdisc_run() (was: qdisc: validate skb without holding lock) Jesper Dangaard Brouer
2014-10-08 17:38 ` John Fastabend [this message]
2014-10-06 14:12 ` [PATCH net-next] qdisc: validate skb without holding lock Jesper Dangaard Brouer
2014-10-04 3:59 ` [PATCH net-next] net: skb_segment() provides list head and tail Eric Dumazet
2014-10-06 4:38 ` David Miller
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