netdev - Re: net: cleanup

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Message-ID: <20170424120835.GA20444@breakpoint.cc>
Date:   Mon, 24 Apr 2017 14:08:35 +0200
From:   Florian Westphal <fw@...len.de>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Florian Westphal <fw@...len.de>,
        Eric Dumazet <edumazet@...gle.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net: cleanup_net is slow

Andrey Konovalov <andreyknvl@...gle.com> wrote:
> On Fri, Apr 21, 2017 at 9:45 PM, Florian Westphal <fw@...len.de> wrote:
> > Florian Westphal <fw@...len.de> wrote:
> >> Indeed.  Setting net.netfilter.nf_conntrack_default_on=0 cuts time
> >> cleanup time by 2/3 ...
> >>
> >> nf unregister is way too happy to issue synchronize_net(), I'll work on
> >> a fix.
> >
> > I'll test this patch as a start.  Maybe we can also leverage exit_batch
> > more on netfilter side.
> 
> Hi Florian,
> 
> Your patch improves fuzzing speed at least twice, which is a great start!

Great.  I'll try to push the patches i have to nf-next ASAP.