netdev - Re: Urgent Bug report: PPPoE ioctl(PPPIOCCONNECT): Transport endpoint is not connected

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Date:   Thu, 16 Sep 2021 23:00:34 +0300
From:   Martin Zaharinov <micron10@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     Guillaume Nault <gnault@...hat.com>,
        netdev <netdev@...r.kernel.org>
Subject: Re: Urgent  Bug report: PPPoE ioctl(PPPIOCCONNECT): Transport
 endpoint is not connected

Small Updates

After switch from frr to bird bgp reduce load from frr
but still when have disconnect 5k+ users have slow pppoe_flush_dev




   PerfTop:   15606 irqs/sec  kernel:77.7%  exact: 100.0% lost: 0/0 drop: 0/0 [4000Hz cycles],  (all, 12 CPUs)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

     8.24%  [kernel]              [k] osq_lock
     7.55%  [kernel]              [k] mutex_spin_on_owner
     7.04%  [pppoe]               [k] pppoe_flush_dev
     2.77%  libteam.so.5.6.1      [.] 0x0000000000009e7d
     2.67%  libteam.so.5.6.1      [.] 0x0000000000006470
     1.90%  [kernel]              [k] fib_table_flush
     1.73%  [kernel]              [k] queued_read_lock_slowpath
     1.68%  [kernel]              [k] next_uptodate_page
     1.36%  ip                    [.] 0x0000000000011b74
     1.23%  ip                    [.] 0x00000000000121b0
     1.09%  [kernel]              [k] zap_pte_range
     0.99%  libteam.so.5.6.1      [.] 0x0000000000006501
     0.88%  dtvbras               [.] 0x0000000000014be8
     0.87%  [kernel]              [k] inet_dump_ifaddr
     0.74%  [kernel]              [k] filemap_map_pages
     0.72%  [kernel]              [k] neigh_flush_dev.isra.0
     0.66%  [kernel]              [k] snmp_get_cpu_field
     0.65%  [kernel]              [k] fib_table_insert
     0.63%  [kernel]              [k] native_irq_return_iret
     0.63%  libteam.so.5.6.1      [.] 0x0000000000005c78
     0.60%  [kernel]              [k] copy_page
     0.52%  libteam.so.5.6.1      [.] 0x000000000000647f
     0.50%  [kernel]              [k] _raw_spin_lock
     0.48%  libc.so.6             [.] 0x00000000000965a2
     0.45%  [kernel]              [k] _raw_read_lock_bh
     0.44%  [kernel]              [k] release_pages
     0.42%  [kernel]              [k] clear_page_erms
     0.42%  [kernel]              [k] page_remove_rmap
     0.41%  [kernel]              [k] queued_spin_lock_slowpath
     0.38%  [kernel]              [k] kmem_cache_alloc
     0.36%  [kernel]              [k] vma_interval_tree_insert
     0.36%  libteam.so.5.6.1      [.] 0x0000000000009e6f
     0.36%  [kernel]              [k] do_set_pte


sessions:
  starting: 296
  active: 3868
  finishing: 6748



> On 14 Sep 2021, at 14:00, Florian Westphal <fw@...len.de> wrote:
> 
> Martin Zaharinov <micron10@...il.com> wrote:
> 
> [ Trimming CC list ]
> 
>> Florian: 
>> 
>> If you make patch send to test please.
> 
> Attached.  No idea if it helps, but 'ip' should stay responsive
> even when masquerade processes netdevice events.
> <defer_masq_work.diff>