RE: [RFC PATCH 00/30] Kernel NET policy

From	"Liang, Kan" <kan.liang@intel.com>
Newsgroups	linux.kernel
Subject	RE: [RFC PATCH 00/30] Kernel NET policy
Date	2016-07-19 03:50 +0200
Message-ID	<rWsky-5MD-3@gated-at.bofh.it> (permalink)
References	(1 earlier) <rWiuR-7Ug-13@gated-at.bofh.it> <rWiXU-85S-15@gated-at.bofh.it> <rWm5r-1OZ-15@gated-at.bofh.it> <rWmI9-233-5@gated-at.bofh.it> <rWoJX-3mk-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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> 
> > Also of course it would be fundamentally less efficient than kernel
> > code doing that, just because of the additional context switches
> > needed.
> 
> Synchronizing or configuring any kind of queues already requires rtnl_mutex.
> I didn't test it but acquiring rtnl mutex in inet_recvmsg is unlikely to fly
> performance wise and

Yes, rtnl will bring some overheads. But the configuration is one time thing for
application or socket. It only happens on receiving first packet.
Unless the application/socket only transmit few packets, the overhead
could be ignored. If they only transmit few packets, why they care about
performance?

> might even be very dangerous under DoS attacks (like
> I see in 24/30).
> 
Patch 29/30 tries to prevent such case.

Thanks,
Kan

Thread

[RFC PATCH 00/30] Kernel NET policy kan.liang@intel.com - 2016-07-18 16:30 +0200
  [RFC PATCH 10/30] net/netpolicy: introduce netpolicy object kan.liang@intel.com - 2016-07-18 16:30 +0200
  [RFC PATCH 20/30] net/netpolicy: introduce per socket netpolicy kan.liang@intel.com - 2016-07-18 16:30 +0200
  [RFC PATCH 28/30] net/netpolicy: optimize for queue pair kan.liang@intel.com - 2016-07-18 16:30 +0200
  [RFC PATCH 29/30] net/netpolicy: limit the total record number kan.liang@intel.com - 2016-07-18 16:30 +0200
  [RFC PATCH 30/30] Documentation/networking: Document net policy kan.liang@intel.com - 2016-07-18 16:30 +0200
    Re: [RFC PATCH 30/30] Documentation/networking: Document net policy Randy Dunlap <rdunlap@infradead.org> - 2016-07-18 19:10 +0200
  [RFC PATCH 24/30] net/netpolicy: set rx queues according to policy kan.liang@intel.com - 2016-07-18 16:30 +0200
  [RFC PATCH 23/30] i40e/ethtool: support RX_CLS_LOC_ANY kan.liang@intel.com - 2016-07-18 16:30 +0200
    Re: [RFC PATCH 23/30] i40e/ethtool: support RX_CLS_LOC_ANY Alexander Duyck <alexander.duyck@gmail.com> - 2016-07-18 18:30 +0200
  [RFC PATCH 14/30] net/netpolicy: add MIX policy kan.liang@intel.com - 2016-07-18 16:30 +0200
  [RFC PATCH 19/30] net/netpolicy: implement netpolicy register kan.liang@intel.com - 2016-07-18 16:30 +0200
  [RFC PATCH 27/30] net/netpolicy: fast path for finding the queues kan.liang@intel.com - 2016-07-18 16:30 +0200
  [RFC PATCH 09/30] net/netpolicy: enable and disable net policy kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 18/30] net/netpolicy: handle channel changes kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 08/30] net/netpolicy: set and remove irq affinity kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 16/30] net/netpolicy: net device hotplug kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 04/30] net/netpolicy: get driver information kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 15/30] i40e/netpolicy: add MIX policy support kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 05/30] i40e/netpolicy: implement ndo_get_irq_info kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 11/30] net/netpolicy: set net policy by policy name kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 01/30] net: introduce NET policy kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 03/30] i40e/netpolicy: Implement ndo_netpolicy_init kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 17/30] net/netpolicy: support CPU hotplug kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 02/30] net/netpolicy: init NET policy kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 06/30] net/netpolicy: get CPU information kan.liang@intel.com - 2016-07-18 16:40 +0200
  [RFC PATCH 07/30] net/netpolicy: create CPU and queue mapping kan.liang@intel.com - 2016-07-18 16:40 +0200
  Re: [RFC PATCH 00/30] Kernel NET policy Florian Westphal <fw@strlen.de> - 2016-07-18 17:20 +0200
    Re: [RFC PATCH 00/30] Kernel NET policy Andi Kleen <andi@firstfloor.org> - 2016-07-18 17:50 +0200
      Re: [RFC PATCH 00/30] Kernel NET policy Cong Wang <xiyou.wangcong@gmail.com> - 2016-07-18 20:00 +0200
        Re: [RFC PATCH 00/30] Kernel NET policy Cong Wang <xiyou.wangcong@gmail.com> - 2016-07-18 22:20 +0200
          RE: [RFC PATCH 00/30] Kernel NET policy "Liang, Kan" <kan.liang@intel.com> - 2016-07-18 22:30 +0200
        RE: [RFC PATCH 00/30] Kernel NET policy "Liang, Kan" <kan.liang@intel.com> - 2016-07-18 22:20 +0200
      Re: [RFC PATCH 00/30] Kernel NET policy Hannes Frederic Sowa <hannes@stressinduktion.org> - 2016-07-18 21:10 +0200
        Re: [RFC PATCH 00/30] Kernel NET policy Andi Kleen <andi@firstfloor.org> - 2016-07-18 21:50 +0200
          Re: [RFC PATCH 00/30] Kernel NET policy Hannes Frederic Sowa <hannes@stressinduktion.org> - 2016-07-19 00:00 +0200
            RE: [RFC PATCH 00/30] Kernel NET policy "Liang, Kan" <kan.liang@intel.com> - 2016-07-19 03:50 +0200
              Re: [RFC PATCH 00/30] Kernel NET policy David Miller <davem@davemloft.net> - 2016-07-19 07:10 +0200
                RE: [RFC PATCH 00/30] Kernel NET policy "Liang, Kan" <kan.liang@intel.com> - 2016-07-19 15:50 +0200
    RE: [RFC PATCH 00/30] Kernel NET policy "Liang, Kan" <kan.liang@intel.com> - 2016-07-18 18:00 +0200
      Re: [RFC PATCH 00/30] Kernel NET policy Florian Westphal <fw@strlen.de> - 2016-07-18 18:20 +0200
        RE: [RFC PATCH 00/30] Kernel NET policy "Liang, Kan" <kan.liang@intel.com> - 2016-07-18 19:50 +0200
      Re: [RFC PATCH 00/30] Kernel NET policy Tom Herbert <tom@herbertland.com> - 2016-07-18 18:40 +0200
        RE: [RFC PATCH 00/30] Kernel NET policy "Liang, Kan" <kan.liang@intel.com> - 2016-07-18 20:00 +0200
  Re: [RFC PATCH 00/30] Kernel NET policy Daniel Borkmann <daniel@iogearbox.net> - 2016-07-18 18:30 +0200
    RE: [RFC PATCH 00/30] Kernel NET policy "Liang, Kan" <kan.liang@intel.com> - 2016-07-18 20:40 +0200
      Re: [RFC PATCH 00/30] Kernel NET policy Daniel Borkmann <daniel@iogearbox.net> - 2016-07-18 23:00 +0200
  Re: [RFC PATCH 00/30] Kernel NET policy Alexander Duyck <alexander.duyck@gmail.com> - 2016-07-18 19:10 +0200
    RE: [RFC PATCH 00/30] Kernel NET policy "Liang, Kan" <kan.liang@intel.com> - 2016-07-18 21:50 +0200
      Re: [RFC PATCH 00/30] Kernel NET policy Andi Kleen <andi@firstfloor.org> - 2016-07-18 22:00 +0200

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