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Date: Thu, 29 Jan 2009 20:49:45 +0100
From: Paweł Staszewski <pstaszewski@...are.pl>
To: Linux Network Development list <netdev@...r.kernel.org>
Subject: affinity with ixgbe and e1000 performance problem
My configuration is:
Packets per sec stats for eth2: eth2: 98180.64
P/s 92751.50 P/s 190932.14 P/s
5k users (600TX/600RX Mbit/s traffic) -> ixbge (eth2) - (Routing with
some TC rules binded on eth2) - e1000e (eth0) -> BGP internet connection
The best configuration for my config is to bind all TX queues provided
by ixgbe to one CPU and all RX queues bind to the same cpu but different
core:
#RX Queues
#CPU6
echo "00000040" > /proc/irq/760/smp_affinity
#CPU6
echo "00000040" > /proc/irq/759/smp_affinity
#CPU6
echo "00000040" > /proc/irq/758/smp_affinity
#CPU6
echo "00000040" > /proc/irq/757/smp_affinity
#CPU6
echo "00000040" > /proc/irq/756/smp_affinity
#CPU6
echo "00000040" > /proc/irq/755/smp_affinity
#CPU6
echo "00000040" > /proc/irq/754/smp_affinity
#CPU6
echo "00000040" > /proc/irq/753/smp_affinity
#TX Queues
#CPU7
echo "00000080" > /proc/irq/752/smp_affinity
#CPU7
echo "00000080" > /proc/irq/751/smp_affinity
#CPU7
echo "00000080" > /proc/irq/750/smp_affinity
#CPU7
echo "00000080" > /proc/irq/749/smp_affinity
#CPU7
echo "00000080" > /proc/irq/748/smp_affinity
#CPU7
echo "00000080" > /proc/irq/747/smp_affinity
#CPU7
echo "00000080" > /proc/irq/746/smp_affinity
#CPU7
echo "00000080" > /proc/irq/745/smp_affinity
cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 CPU4
CPU5 CPU6 CPU7
0: 591 0 1 1 1
0 0 0 IO-APIC-edge timer
1: 0 0 0 1 1
0 0 0 IO-APIC-edge i8042
2: 0 0 0 0 0
0 0 0 XT-PIC-XT cascade
14: 298406 51463 7792 27548 29476
12089 26505 6341 IO-APIC-edge ata_piix
15: 287429 51187 9248 30188 31580
13463 29119 7235 IO-APIC-edge ata_piix
18: 0 0 0 0 0
0 0 0 IO-APIC-fasteoi ata_piix
743: 1 1 1 0 0
1 1 0 PCI-MSI-edge ioat-msi
744: 0 0 0 0 0
0 0 0 PCI-MSI-edge eth2:lsc
745: 318172 317655 317562 317142 316876
316799 317974 739013828 PCI-MSI-edge eth2:v15-Tx
746: 298137 298211 296740 296939 296282
739759610 297614 7438163 PCI-MSI-edge eth2:v14-Tx
747: 1559123 644402799 99789617 287701 288215
287857 288616 7154951 PCI-MSI-edge eth2:v13-Tx
748: 373710 374356 372706 372433 372002 375131
733662933 8555427 PCI-MSI-edge eth2:v12-Tx
749: 221412 219233 218593 705892020 219134
218514 219799 6793416 PCI-MSI-edge eth2:v11-Tx
750: 262658 263363 748062639 261498 261082
261410 262243 7321505 PCI-MSI-edge eth2:v10-Tx
751: 240273 1480823 236860 237611 237130
237598 238502 728687718 PCI-MSI-edge eth2:v9-Tx
752: 294598 295005 291885 292774 293686
727173598 2115060 6725300 PCI-MSI-edge eth2:v8-Tx
753: 258014 257817 742505 259197 259043
1342576 6479474 856607531 PCI-MSI-edge eth2:v7-Rx
754: 334267 335255 835205 336807 336132
868562084 6543966 1158909 PCI-MSI-edge eth2:v6-Rx
755: 3690754 390454 852176660 393161 392236
391953 6662034 1213866 PCI-MSI-edge eth2:v5-Rx
756: 379899 379343 1952782 381682 382621
381935 6740919 851518995 PCI-MSI-edge eth2:v4-Rx
757: 373727 821494 376012 872120928 376909
2522737 5248042 1171367 PCI-MSI-edge eth2:v3-Rx
758: 223936 664130 859120583 225014 225297
2405058 5048689 992416 PCI-MSI-edge eth2:v2-Rx
759: 266000 867871307 268377 268467 267702
2436081 3993157 1036480 PCI-MSI-edge eth2:v1-Rx
760: 223649 1674767 224738 223864 223143 2437023
873857572 1004736 PCI-MSI-edge eth2:v0-Rx
761: 44 38 29 42 31
91396 33 34 PCI-MSI-edge eth1
762: 648754 647796 648500 647914 1945303547
647749 648492 711525 PCI-MSI-edge eth0
NMI: 26666124 252632331 481690098 271053301 1186861381 286981764
268209667 474805931 Non-maskable interrupts
LOC: 39356847 18286535 20866132 5677806 2611924653 3781095
13778136 5061266 Local timer interrupts
RES: 2885 1810 1957 1444 1435
713 1984 1927 Rescheduling interrupts
CAL: 399 1164 1136 1142 1179
1179 1122 1149 Function call interrupts
TLB: 9175 2609 14009 11160 3887
2385 11260 14634 TLB shootdowns
SPU: 0 0 0 0 0
0 0 0 Spurious interrupts
ERR: 0
MIS: 0
On all different configurations i have problem with CPU load
because if i put all interrupts from ixgbe driver to one CPU i have
60-70% of CPU load
But if i put Only TX on one cpu i have 1% to 2% CPU load that TX make
And RX only on CPU6 make about 37% cpu load
mpstat -P ALL 1 30
Average: CPU %user %nice %sys %iowait %irq %soft
%steal %idle intr/s
Average: all 0.01 0.00 0.01 0.00 0.49 7.13
0.00 92.36 193371.81
Average: 0 0.00 0.00 0.00 0.00 0.00 0.00
0.00 100.00 0.00
Average: 1 0.00 0.00 0.00 0.00 0.00 0.00
0.00 100.00 0.00
Average: 2 0.00 0.00 0.10 0.00 0.00 0.00
0.00 99.90 0.00
Average: 3 0.00 0.00 0.00 0.00 0.00 0.00
0.00 100.00 0.00
Average: 4 0.07 0.00 0.03 0.00 1.00 22.18
0.00 76.72 9576.51
Average: 5 0.00 0.00 0.00 0.00 0.00 0.00
0.00 100.00 0.53
Average: 6 0.00 0.00 0.00 0.00 2.64 37.04
0.00 60.31 79676.44
Average: 7 0.00 0.00 0.00 0.00 0.41 0.14
0.00 99.45 61901.23
And another thing is that my e1000e driver is make the same volume of
traffic that ixgbe but e1000e make only 22% CPU load (is binded to cpu 4
by affinity)
And why ixgbe driver is make x10 more interrupst per sec compared to
e1000e driver
only difference is that on eth2 i have 200vlans and traffic is on this
vlans with 5000 tc rules (with hashing filters)
opreport -l
CPU: Core 2, speed 3000 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a
unit mask of 0x00 (Unhalted core cycles) count 100000
samples % image name app name
symbol name
76985 8.0647 vmlinux vmlinux
do_ipt_get_ctl
63374 6.6389 vmlinux vmlinux
u32_delete
34018 3.5636 vmlinux vmlinux
_raw_spin_trylock
24586 2.5755 vmlinux vmlinux
__ip_route_output_key
24534 2.5701 vmlinux vmlinux
update_persistent_clock
22736 2.3817 vmlinux vmlinux
e1000_get_eeprom
21037 2.2038 vmlinux vmlinux
irq_entries_start
19653 2.0588 vmlinux vmlinux
__pskb_pull_tail
19329 2.0248 vmlinux vmlinux
ixgbe_update_rx_dca
18826 1.9721 vmlinux vmlinux
devm_ioport_unmap
16959 1.7766 vmlinux vmlinux
ixgbe_alloc_rx_buffers
16188 1.6958 vmlinux vmlinux
e1000_open
15642 1.6386 vmlinux vmlinux
htb_dequeue
13627 1.4275 vmlinux vmlinux
ctrl_dumpfamily
13511 1.4154 vmlinux vmlinux
native_calibrate_tsc
11485 1.2031 vmlinux vmlinux
dev_ethtool
11449 1.1994 vmlinux vmlinux
mach_set_rtc_mmss
11405 1.1948 vmlinux vmlinux
update_wall_time
11221 1.1755 vmlinux vmlinux
dev_seq_show
10932 1.1452 vmlinux vmlinux
ip_route_input
10816 1.1330 vmlinux vmlinux
ixgbe_clean_rx_irq
10498 1.0997 vmlinux vmlinux
e1000_clean_rx_irq_ps
10439 1.0936 vmlinux vmlinux
skb_copy_and_csum_bits
10299 1.0789 vmlinux vmlinux
devm_ioport_map
10290 1.0779 vmlinux vmlinux
e1000_xmit_frame
10198 1.0683 vmlinux vmlinux
text_poke
10105 1.0586 vmlinux vmlinux
ixgbe_setup_dca
9967 1.0441 vmlinux vmlinux
ixgbe_vlan_rx_kill_vid
9755 1.0219 vmlinux vmlinux
xt_check_match
9379 0.9825 vmlinux vmlinux sfq_init
9159 0.9595 vmlinux vmlinux
ixgbe_clean_tx_irq
9091 0.9523 vmlinux vmlinux
hfsc_reset_qdisc
8879 0.9301 vmlinux vmlinux udp_mt
8874 0.9296 vmlinux vmlinux
devm_ioremap
8347 0.8744 vmlinux vmlinux
rwlock_bug
8181 0.8570 vmlinux vmlinux
ixgbe_xmit_frame
7502 0.7859 vmlinux vmlinux
htb_delete
7199 0.7541 vmlinux vmlinux
ip_defrag
6532 0.6843 vmlinux vmlinux htb_init
6279 0.6578 vmlinux vmlinux
dev_queue_xmit
6264 0.6562 vmlinux vmlinux
apply_alternatives
6252 0.6549 vmlinux vmlinux
ixgbe_configure
6190 0.6484 vmlinux vmlinux
posix_cpu_timer_del
6110 0.6401 vmlinux vmlinux
radix_tree_delete
5875 0.6154 vmlinux vmlinux s_stop
5496 0.5757 vmlinux vmlinux
ip_push_pending_frames
5398 0.5655 vmlinux vmlinux
fib_rules_register
5007 0.5245 vmlinux vmlinux
ixgbe_init_interrupt_scheme
4908 0.5141 vmlinux vmlinux
do_sysinfo
4821 0.5050 vmlinux vmlinux
e1000e_update_stats
4722 0.4947 vmlinux vmlinux
_format_mac_addr
4219 0.4420 vmlinux vmlinux
__local_trigger
4141 0.4338 vmlinux vmlinux
genl_register_mc_group
3805 0.3986 vmlinux vmlinux
cache_alloc_refill
3678 0.3853 vmlinux vmlinux
packet_rcv
3548 0.3717 vmlinux vmlinux
tc_ctl_action
--
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