netdev - Re: [PATCH net-next 00/10] net_sched: defer skb freeing while changing qdiscs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 14 Jun 2016 21:20:40 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	"David S . Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [PATCH net-next 00/10] net_sched: defer skb freeing while
 changing qdiscs

On Tue, 2016-06-14 at 19:13 -0700, Cong Wang wrote:

> No objection from me. It looks like a good optimization
> before we can improve the qdisc root spinlock.
> 
> Just one nit: You probably want to keep rtnl_kfree_skbs()
> within qdisc layer unless you have any plan to use it
> in other places.

I do not see other places freeing a lot of skbs under rtnl ;)

As a side effect, using rtnl_kfree_skb() changes call graph given by
drop monitor, so better avoid this unless really needed.