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Date: Tue, 14 Sep 2021 09:16:55 +0300
From: Martin Zaharinov <micron10@...il.com>
To: Guillaume Nault <gnault@...hat.com>
Cc: Pali Rohár <pali@...nel.org>,
Greg KH <gregkh@...uxfoundation.org>,
netdev <netdev@...r.kernel.org>,
Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: Urgent Bug report: PPPoE ioctl(PPPIOCCONNECT): Transport
endpoint is not connected
Hi Nault
See this stats :
Linux 5.14.2 (testb) 09/14/21 _x86_64_ (12 CPU)
11:33:44 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
11:33:45 all 1.75 0.00 18.85 0.00 0.00 5.00 0.00 0.00 0.00 74.40
11:33:46 all 1.74 0.00 17.88 0.00 0.00 4.72 0.00 0.00 0.00 75.66
11:33:47 all 2.23 0.00 17.62 0.00 0.00 5.05 0.00 0.00 0.00 75.10
11:33:48 all 1.82 0.00 13.64 0.00 0.00 5.70 0.00 0.00 0.00 78.84
11:33:49 all 1.50 0.00 13.46 0.00 0.00 5.15 0.00 0.00 0.00 79.90
11:33:50 all 3.06 0.00 13.96 0.00 0.00 4.79 0.00 0.00 0.00 78.20
11:33:51 all 1.40 0.00 16.53 0.00 0.00 5.21 0.00 0.00 0.00 76.86
11:33:52 all 4.43 0.00 19.44 0.00 0.00 6.56 0.00 0.00 0.00 69.57
11:33:53 all 1.51 0.00 16.40 0.00 0.00 4.77 0.00 0.00 0.00 77.32
11:33:54 all 1.51 0.00 16.55 0.00 0.00 4.71 0.00 0.00 0.00 77.23
11:33:55 all 1.00 0.00 13.21 0.00 0.00 5.90 0.00 0.00 0.00 79.90
Average: all 2.00 0.00 16.14 0.00 0.00 5.23 0.00 0.00 0.00 76.63
PerfTop: 28046 irqs/sec kernel:96.3% exact: 100.0% lost: 0/0 drop: 0/0 [4000Hz cycles], (all, 12 CPUs)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
23.37% [nf_conntrack] [k] nf_ct_iterate_cleanup
17.76% [kernel] [k] mutex_spin_on_owner
9.47% [pppoe] [k] pppoe_rcv
7.71% [kernel] [k] osq_lock
2.77% [nf_nat] [k] inet_cmp
2.59% [nf_nat] [k] device_cmp
2.55% [kernel] [k] __local_bh_enable_ip
2.04% [kernel] [k] _raw_spin_lock
1.23% [kernel] [k] __cond_resched
1.16% [kernel] [k] rcu_all_qs
1.13% libfrr.so.0.0.0 [.] 0x00000000000ce970
0.79% [nf_conntrack] [k] nf_conntrack_lock
0.75% libfrr.so.0.0.0 [.] 0x00000000000ce94e
0.53% [kernel] [k] __netif_receive_skb_core.constprop.0
0.46% [kernel] [k] fib_table_lookup
0.46% [ip_tables] [k] ipt_do_table
0.45% [ixgbe] [k] ixgbe_clean_rx_irq
0.37% [kernel] [k] __dev_queue_xmit
0.34% [nf_conntrack] [k] __nf_conntrack_find_get.isra.0
0.33% [ixgbe] [k] ixgbe_clean_tx_irq
0.30% [kernel] [k] menu_select
0.25% [kernel] [k] vlan_do_receive
0.21% [kernel] [k] ip_finish_output2
0.21% [ixgbe] [k] ixgbe_poll
0.20% [kernel] [k] _raw_spin_lock_irqsave
0.19% [kernel] [k] get_rps_cpu
0.19% libc.so.6 [.] 0x0000000000186afa
0.19% [kernel] [k] queued_read_lock_slowpath
0.19% [kernel] [k] do_poll.constprop.0
0.19% [kernel] [k] cpuidle_enter_state
0.18% [kernel] [k] dev_hard_start_xmit
0.18% [kernel] [k] ___slab_alloc.constprop.0
0.17% zebra [.] 0x00000000000b9271
0.16% [kernel] [k] csum_partial_copy_generic
0.16% zebra [.] 0x00000000000b91f1
0.16% [kernel] [k] page_frag_free
0.16% [kernel] [k] kmem_cache_alloc
0.15% [kernel] [k] __skb_flow_dissect
0.15% [kernel] [k] sched_clock
0.15% libc.so.6 [.] 0x00000000000965a2
0.15% [kernel] [k] kmem_cache_free_bulk.part.0
0.15% [pppoe] [k] pppoe_flush_dev
0.15% [ixgbe] [k] ixgbe_tx_map
0.14% [kernel] [k] _raw_spin_lock_bh
0.14% [kernel] [k] fib_table_flush
0.14% [kernel] [k] native_irq_return_iret
0.14% [kernel] [k] __dev_xmit_skb
0.13% [kernel] [k] nf_hook_slow
0.13% [kernel] [k] fib_lookup_good_nhc
0.12% [kernel] [k] __fget_files
0.12% [kernel] [k] process_backlog
0.12% [xt_dtvqos] [k] 0x00000000000008d1
0.12% [kernel] [k] __list_del_entry_valid
0.12% [kernel] [k] skb_release_data
0.12% [kernel] [k] ip_route_input_slow
0.11% [kernel] [k] netif_skb_features
0.11% [kernel] [k] sock_poll
0.11% [kernel] [k] __schedule
0.11% [kernel] [k] __softirqentry_text_start
And on time of problem when try to write : ip a
to list interface wait 15-20 sec i finaly have options to simulate but users is angry when down internet.
In case need to know why system is overloaded when deconfig ppp interface.
Best regards,
Martin
> On 11 Sep 2021, at 9:26, Martin Zaharinov <micron10@...il.com> wrote:
>
> Hi Guillaume
>
> Main problem is overload of service because have many finishing ppp (customer) last two day down from 40-50 to 100-200 users and make problem when is happen if try to type : ip a wait 10-20 sec to start list interface .
> But how to find where is a problem any locking or other.
> And is there options to make fast remove ppp interface from kernel to reduce this load.
>
>
> Martin
>
>> On 7 Sep 2021, at 9:42, Martin Zaharinov <micron10@...il.com> wrote:
>>
>> Perf top from text
>>
>>
>> PerfTop: 28391 irqs/sec kernel:98.0% exact: 100.0% lost: 0/0 drop: 0/0 [4000Hz cycles], (all, 12 CPUs)
>> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>>
>> 17.01% [nf_conntrack] [k] nf_ct_iterate_cleanup
>> 9.73% [kernel] [k] mutex_spin_on_owner
>> 9.07% [pppoe] [k] pppoe_rcv
>> 2.77% [nf_nat] [k] device_cmp
>> 1.66% [kernel] [k] osq_lock
>> 1.65% [kernel] [k] _raw_spin_lock
>> 1.61% [kernel] [k] __local_bh_enable_ip
>> 1.35% [nf_nat] [k] inet_cmp
>> 1.30% [kernel] [k] __netif_receive_skb_core.constprop.0
>> 1.16% [kernel] [k] menu_select
>> 0.99% [kernel] [k] cpuidle_enter_state
>> 0.96% [ixgbe] [k] ixgbe_clean_rx_irq
>> 0.86% [kernel] [k] __dev_queue_xmit
>> 0.70% [kernel] [k] __cond_resched
>> 0.69% [sch_cake] [k] cake_dequeue
>> 0.67% [nf_tables] [k] nft_do_chain
>> 0.63% [kernel] [k] rcu_all_qs
>> 0.61% [kernel] [k] fib_table_lookup
>> 0.57% [kernel] [k] __schedule
>> 0.57% [kernel] [k] skb_release_data
>> 0.54% [kernel] [k] sched_clock
>> 0.54% [kernel] [k] __copy_skb_header
>> 0.53% [kernel] [k] dev_queue_xmit_nit
>> 0.53% [kernel] [k] _raw_spin_lock_irqsave
>> 0.50% [kernel] [k] kmem_cache_free
>> 0.48% libfrr.so.0.0.0 [.] 0x00000000000ce970
>> 0.47% [ixgbe] [k] ixgbe_clean_tx_irq
>> 0.45% [kernel] [k] timerqueue_add
>> 0.45% [kernel] [k] lapic_next_deadline
>> 0.45% [kernel] [k] csum_partial_copy_generic
>> 0.44% [nf_flow_table] [k] nf_flow_offload_ip_hook
>> 0.44% [kernel] [k] kmem_cache_alloc
>> 0.44% [nf_conntrack] [k] nf_conntrack_lock
>>
>>> On 7 Sep 2021, at 9:16, Martin Zaharinov <micron10@...il.com> wrote:
>>>
>>> Hi
>>> Sorry for delay but not easy to catch moment .
>>>
>>>
>>> See this is mpstatl 1 :
>>>
>>> Linux 5.14.1 (demobng) 09/07/21 _x86_64_ (12 CPU)
>>>
>>> 11:12:16 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
>>> 11:12:17 all 0.17 0.00 6.66 0.00 0.00 4.13 0.00 0.00 0.00 89.05
>>> 11:12:18 all 0.25 0.00 8.36 0.00 0.00 4.88 0.00 0.00 0.00 86.51
>>> 11:12:19 all 0.26 0.00 9.62 0.00 0.00 3.91 0.00 0.00 0.00 86.21
>>> 11:12:20 all 0.85 0.00 6.00 0.00 0.00 4.31 0.00 0.00 0.00 88.84
>>> 11:12:21 all 0.08 0.00 4.45 0.00 0.00 4.79 0.00 0.00 0.00 90.67
>>> 11:12:22 all 0.17 0.00 9.50 0.00 0.00 4.58 0.00 0.00 0.00 85.75
>>> 11:12:23 all 0.00 0.00 6.92 0.00 0.00 2.48 0.00 0.00 0.00 90.61
>>> 11:12:24 all 0.17 0.00 5.45 0.00 0.00 4.27 0.00 0.00 0.00 90.11
>>> 11:12:25 all 0.25 0.00 5.38 0.00 0.00 4.79 0.00 0.00 0.00 89.58
>>> 11:12:26 all 0.60 0.00 1.45 0.00 0.00 2.65 0.00 0.00 0.00 95.30
>>> 11:12:27 all 0.42 0.00 6.91 0.00 0.00 4.47 0.00 0.00 0.00 88.20
>>> 11:12:28 all 0.00 0.00 6.75 0.00 0.00 4.18 0.00 0.00 0.00 89.07
>>> 11:12:29 all 0.17 0.00 3.52 0.00 0.00 5.11 0.00 0.00 0.00 91.20
>>> 11:12:30 all 1.45 0.00 10.14 0.00 0.00 3.49 0.00 0.00 0.00 84.92
>>> 11:12:31 all 0.09 0.00 5.11 0.00 0.00 4.77 0.00 0.00 0.00 90.03
>>> 11:12:32 all 0.25 0.00 3.11 0.00 0.00 4.46 0.00 0.00 0.00 92.17
>>> Average: all 0.32 0.00 6.21 0.00 0.00 4.21 0.00 0.00 0.00 89.26
>>>
>>>
>>> I attache and one screenshot from perf top (Screenshot is send on preview mail)
>>>
>>> And I see in lsmod
>>>
>>> pppoe 20480 8198
>>> pppox 16384 1 pppoe
>>> ppp_generic 45056 16364 pppox,pppoe
>>> slhc 16384 1 ppp_generic
>>>
>>> To slow remove pppoe session .
>>>
>>> And from log :
>>>
>>> [2021-09-07 11:01:11.129] vlan3020: ebdd1c5d8b5900f6: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>> [2021-09-07 11:01:53.621] vlan643: ebdd1c5d8b59014e: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>> [2021-09-07 11:02:00.359] vlan1616: ebdd1c5d8b590195: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>> [2021-09-07 11:02:05.859] vlan3020: ebdd1c5d8b5900d8: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>> [2021-09-07 11:02:08.258] vlan3005: ebdd1c5d8b590190: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>> [2021-09-07 11:02:13.820] vlan643: ebdd1c5d8b590152: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>> [2021-09-07 11:02:15.839] vlan727: ebdd1c5d8b590144: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>> [2021-09-07 11:02:20.139] vlan1693: ebdd1c5d8b59019f: ioctl(PPPIOCCONNECT): Transport endpoint is not connected
>>>
>>>> On 11 Aug 2021, at 19:48, Guillaume Nault <gnault@...hat.com> wrote:
>>>>
>>>> On Wed, Aug 11, 2021 at 02:10:32PM +0300, Martin Zaharinov wrote:
>>>>> And one more that see.
>>>>>
>>>>> Problem is come when accel start finishing sessions,
>>>>> Now in server have 2k users and restart on one of vlans 3 Olt with 400 users and affect other vlans ,
>>>>> And problem is start when start destroying dead sessions from vlan with 3 Olt and this affect all other vlans.
>>>>> May be kernel destroy old session slow and entrained other users by locking other sessions.
>>>>> is there a way to speed up the closing of stopped/dead sessions.
>>>>
>>>> What are the CPU stats when that happen? Is it users space or kernel
>>>> space that keeps it busy?
>>>>
>>>> One easy way to check is to run "mpstat 1" for a few seconds when the
>>>> problem occurs.
>>>>
>>>
>>
>
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