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Date: Sun, 15 Jan 2017 01:05:58 +0200
From: Denys Fedoryshchenko <nuclearcat@...learcat.com>
To: Guillaume Nault <g.nault@...halink.fr>,
Netfilter Devel <netfilter-devel@...r.kernel.org>,
Pablo Neira Ayuso <pablo@...filter.org>,
Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: 4.9 conntrack performance issues
Hi!
Sorry if i added someone wrongly to CC, please let me know, if i should
remove.
I just run successfully 4.9 on my nat several days ago, and seems panic
issue disappeared. But i started to face another issue, it seems garbage
collector is hogging one of CPU's.
Here is my data:
2xE5-2640 v3
396G ram
2x10G (bonding) with approx 14-15G load at peak time
It was handling load very well at 4.8 and below, it might be still fine,
but i suspect queues that belong to hogged cpu might experience issues.
Is there anything can be done to improve cpu load distribution or reduce
single core load?
net.netfilter.nf_conntrack_buckets = 65536
net.netfilter.nf_conntrack_checksum = 1
net.netfilter.nf_conntrack_count = 1236021
net.netfilter.nf_conntrack_events = 1
net.netfilter.nf_conntrack_expect_max = 1024
net.netfilter.nf_conntrack_generic_timeout = 600
net.netfilter.nf_conntrack_helper = 0
net.netfilter.nf_conntrack_icmp_timeout = 30
net.netfilter.nf_conntrack_log_invalid = 0
net.netfilter.nf_conntrack_max = 6553600
net.netfilter.nf_conntrack_tcp_be_liberal = 0
net.netfilter.nf_conntrack_tcp_loose = 0
net.netfilter.nf_conntrack_tcp_max_retrans = 3
net.netfilter.nf_conntrack_tcp_timeout_close = 10
net.netfilter.nf_conntrack_tcp_timeout_close_wait = 10
net.netfilter.nf_conntrack_tcp_timeout_established = 600
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 20
net.netfilter.nf_conntrack_tcp_timeout_last_ack = 20
net.netfilter.nf_conntrack_tcp_timeout_max_retrans = 60
net.netfilter.nf_conntrack_tcp_timeout_syn_recv = 10
net.netfilter.nf_conntrack_tcp_timeout_syn_sent = 20
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 20
net.netfilter.nf_conntrack_tcp_timeout_unacknowledged = 30
net.netfilter.nf_conntrack_timestamp = 0
net.netfilter.nf_conntrack_udp_timeout = 30
net.netfilter.nf_conntrack_udp_timeout_stream = 180
net.nf_conntrack_max = 6553600
it is non-peak values, as adjustments i have shorter than default
timeouts. Changing net.netfilter.nf_conntrack_buckets to higher value
doesn't fix issue.
I noticed that one of CPU's hogged (N24 in this case):
Linux 4.9.2-build-0127 (NAT) 01/14/17 _x86_64_ (32 CPU)
23:01:54 CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %idle
23:02:04 all 0.09 0.00 1.60 0.01 0.00 28.28 0.00
0.00 70.01
23:02:04 0 0.11 0.00 0.00 0.00 0.00 32.38 0.00
0.00 67.51
23:02:04 1 0.12 0.00 0.12 0.00 0.00 29.91 0.00
0.00 69.86
23:02:04 2 0.23 0.00 0.11 0.00 0.00 29.57 0.00
0.00 70.09
23:02:04 3 0.11 0.00 0.11 0.11 0.00 28.80 0.00
0.00 70.86
23:02:04 4 0.23 0.00 0.11 0.11 0.00 31.41 0.00
0.00 68.14
23:02:04 5 0.11 0.00 0.00 0.00 0.00 29.28 0.00
0.00 70.61
23:02:04 6 0.11 0.00 0.11 0.00 0.00 31.81 0.00
0.00 67.96
23:02:04 7 0.11 0.00 0.11 0.00 0.00 32.69 0.00
0.00 67.08
23:02:04 8 0.00 0.00 0.23 0.00 0.00 42.12 0.00
0.00 57.64
23:02:04 9 0.11 0.00 0.00 0.00 0.00 30.86 0.00
0.00 69.02
23:02:04 10 0.11 0.00 0.11 0.00 0.00 30.93 0.00
0.00 68.84
23:02:04 11 0.00 0.00 0.11 0.00 0.00 32.73 0.00
0.00 67.16
23:02:04 12 0.11 0.00 0.11 0.00 0.00 29.85 0.00
0.00 69.92
23:02:04 13 0.00 0.00 0.00 0.00 0.00 30.96 0.00
0.00 69.04
23:02:04 14 0.00 0.00 0.00 0.00 0.00 30.09 0.00
0.00 69.91
23:02:04 15 0.00 0.00 0.11 0.00 0.00 30.63 0.00
0.00 69.26
23:02:04 16 0.11 0.00 0.00 0.00 0.00 25.88 0.00
0.00 74.01
23:02:04 17 0.11 0.00 0.00 0.00 0.00 22.82 0.00
0.00 77.07
23:02:04 18 0.11 0.00 0.00 0.00 0.00 23.75 0.00
0.00 76.14
23:02:04 19 0.11 0.00 0.11 0.00 0.00 24.86 0.00
0.00 74.92
23:02:04 20 0.11 0.00 0.11 0.11 0.00 24.48 0.00
0.00 75.19
23:02:04 21 0.22 0.00 0.11 0.00 0.00 23.43 0.00
0.00 76.24
23:02:04 22 0.11 0.00 0.11 0.00 0.00 25.46 0.00
0.00 74.32
23:02:04 23 0.00 0.00 0.11 0.00 0.00 25.47 0.00
0.00 74.41
23:02:04 24 0.00 0.00 45.06 0.00 0.00 42.18 0.00
0.00 12.76
23:02:04 25 0.11 0.00 0.11 0.11 0.00 25.22 0.00
0.00 74.46
23:02:04 26 0.11 0.00 0.00 0.11 0.00 23.39 0.00
0.00 76.39
23:02:04 27 0.22 0.00 0.11 0.00 0.00 23.83 0.00
0.00 75.85
23:02:04 28 0.11 0.00 0.11 0.00 0.00 24.10 0.00
0.00 75.68
23:02:04 29 0.11 0.00 0.11 0.00 0.00 23.80 0.00
0.00 75.98
23:02:04 30 0.11 0.00 0.11 0.00 0.00 23.45 0.00
0.00 76.33
23:02:04 31 0.11 0.00 0.11 0.00 0.00 20.37 0.00
0.00 79.42
And this is output of ./perf top -C 24 -e cycles
PerfTop: 933 irqs/sec kernel:100.0% exact: 0.0% [1000Hz
cycles], (all, CPU: 24)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
52.68% [nf_conntrack] [k] gc_worker
3.88% [ip_tables] [k] ipt_do_table
2.39% [ixgbe] [k] ixgbe_xmit_frame_ring
2.29% [kernel] [k] _raw_spin_lock
1.84% [ixgbe] [k] ixgbe_poll
1.76% [nf_conntrack] [k] __nf_conntrack_find_get
perf report for this cpu (same, cycles)
# Children Self Command Shared Object Symbol
# ........ ........ ............ ......................
....................................................
#
88.98% 0.00% kworker/24:1 [kernel.kallsyms] [k]
process_one_work
|
---process_one_work
|
|--54.65%--gc_worker
| |
| --3.58%--nf_ct_gc_expired
| |
| |--1.90%--nf_ct_delete
| | |
| |
--1.31%--nf_ct_delete_from_lists
| |
| --1.61%--nf_conntrack_destroy
| destroy_conntrack
| |
|
--1.53%--nf_conntrack_free
| |
|
|--0.80%--kmem_cache_free
| | |
| |
--0.51%--__slab_free.isra.12
| |
|
--0.52%--__nf_ct_ext_destroy
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