netdev - Re: [net] net: sched: shrink struct qdisc_skb

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Date:	Fri, 19 Sep 2014 15:07:12 +0300
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Doug Ledford <dledford@...ntricity.com>,
	David Miller <davem@...emloft.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Govindarajulu Varadarajan <_govind@....com>,
	Yinghai Lu <yinghai@...nel.org>,
	NetDev <netdev@...r.kernel.org>, ssujith@...co.com,
	gvaradar@...co.com, "Christian Benvenuti (benve)" <benve@...co.com>
Subject: Re: [net] net: sched: shrink struct qdisc_skb_cb to 28 bytes

On Fri, Sep 19, 2014 at 1:29 AM, Doug Ledford <dledford@...ntricity.com> wrote:
> On 09/18/2014 11:02 AM, Eric Dumazet wrote:
>> From: Eric Dumazet <edumazet@...gle.com>
>> We cannot make struct qdisc_skb_cb bigger without impacting IPoIB,
>> or increasing skb->cb[] size.
>>
>> Commit e0f31d849867 ("flow_keys: Record IP layer protocol in
>> skb_flow_dissect()") broke IPoIB.
>>
>> Only current offender is sch_choke, and this one do not need an
>> absolutely precise flow key.
>>
>> If we store 17 bytes of flow key, its more than enough. (Its the actual
>> size of flow_keys if it was a packed structure, but we might add new
>> fields at the end of it later)
>>
>> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
>> Fixes: e0f31d849867 ("flow_keys: Record IP layer protocol in
>> skb_flow_dissect()")

> I've installed this patch on my cluster and it resolves the problem.
> Tested-by/Acked-by: Doug Ledford <dledford@...hat.com>

Thanks Eric/Doug!

Dave - just to make sure, this is for net, as the regression was
introduced in 3.17-rc1.

Or.
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