e1000 latency problem or what ?

From: Oleksandr Samoylyk
Date: Mon Mar 03 2008 - 13:46:06 EST

Dear community,

I'm running a busy pptp-server which serves about 1500 users on about 80 Mbit/s (> 15000 packets/sec) through it. I use poptop, traffic shaper and basic firewall rules.

As for hardware it's a server on SuperMicro Server on X7DB8+ serverboard server with 8 GB RAM on it running Ubuntu Server Edition.

As for problem, sometimes I get the following erors in logs:
Mar 3 15:21:14 vpn kernel: [ 0.000000] BUG: soft lockup - CPU#7 stuck for 11s! [events/7:34]
Mar 3 15:21:14 vpn kernel: [ 0.000000] CPU 7:
Mar 3 15:21:14 vpn kernel: [ 0.000000] Modules linked in: af_packet xt_tcpmss iptable_mangle act_police sch_ingress cls_u32 sch_sfq sch_htb e1000 xt_multiport xt_TCPMSS xt_state xt_limit xt_tcpudp nf_conntrack_pptp nf_conntrack_proto_gre nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_conntrack_ftp iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack e1000e iptable_filter ip_tables x_tables tcp_cubic pptp pppox ppp_generic slhc parport_pc lp parport loop iTCO_wdt iTCO_vendor_support pcspkr shpchp i5000_edac pci_hotplug evdev edac_core ext3 jbd mbcache sg sr_mod cdrom sd_mod ata_piix pata_acpi aic94xx libsas ata_generic libata scsi_transport_sas scsi_mod fuse
Mar 3 15:21:14 vpn kernel: [ 0.000000] Pid: 34, comm: events/7 Not tainted 2.6.24-11-server #1
Mar 3 15:21:14 vpn kernel: [ 0.000000] RIP: 0010:[libata:_spin_unlock_irqrestore+0x8/0x26222] [libata:_spin_unlock_irqrestore+0x8/0x26222] _spin_unlock_irqrestore+0x8/0x10
Mar 3 15:21:14 vpn kernel: [ 0.000000] RSP: 0018:ffff810225a779a0 EFLAGS: 00000246
Mar 3 15:21:14 vpn kernel: [ 0.000000] RAX: 0000000000000000 RBX: ffffc20001a1ab80 RCX: 0000000000000000
Mar 3 15:21:14 vpn kernel: [ 0.000000] RDX: 0000000000000014 RSI: 0000000000000246 RDI: ffff8102249d5aa8
Mar 3 15:21:14 vpn kernel: [ 0.000000] RBP: ffff810225a77920 R08: 0000000000001000 R09: 0000000002000000
Mar 3 15:21:14 vpn kernel: [ 0.000000] R10: 0000000000000000 R11: ffff81021ac01300 R12: ffffffff8020cfb6
Mar 3 15:21:14 vpn kernel: [ 0.000000] R13: 0000000000000000 R14: ffff8102249d5a80 R15: 0000000000000010
Mar 3 15:21:14 vpn kernel: [ 0.000000] FS: 0000000000000000(0000) GS:ffff81022590cd00(0000) knlGS:0000000000000000
Mar 3 15:21:14 vpn kernel: [ 0.000000] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
Mar 3 15:21:14 vpn kernel: [ 0.000000] CR2: 00007fa2778f7315 CR3: 0000000000201000 CR4: 00000000000006e0
Mar 3 15:21:14 vpn kernel: [ 0.000000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Mar 3 15:21:14 vpn kernel: [ 0.000000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Mar 3 15:21:14 vpn kernel: [ 0.000000]
Mar 3 15:21:14 vpn kernel: [ 0.000000] Call Trace:
Mar 3 15:21:14 vpn kernel: [ 0.000000] <IRQ> [<ffffffff8825ab1c>] :e1000:e1000_xmit_frame+0x8fc/0xcb0
Mar 3 15:21:14 vpn kernel: [ 0.000000] [e1000:____versions+0x56f3/0x7340] :nf_conntrack_ipv4:ipv4_confirm+0x33/0x60
Mar 3 15:21:14 vpn kernel: [ 0.000000] [dev_hard_start_xmit+0x22c/0x2a0] dev_hard_start_xmit+0x22c/0x2a0
Mar 3 15:21:14 vpn kernel: [ 0.000000] [__qdisc_run+0x74/0x1f0] __qdisc_run+0x74/0x1f0
Mar 3 15:21:14 vpn kernel: [ 0.000000] [dev_queue_xmit+0x1e8/0x300] dev_queue_xmit+0x1e8/0x300
Mar 3 15:21:14 vpn kernel: [ 0.000000] [pptp:pptp_xmit+0x567/0x7e0] :pptp:pptp_xmit+0x567/0x7e0
Mar 3 15:21:14 vpn kernel: [ 0.000000] [ppp_generic:ppp_push+0x45c/0x620] :ppp_generic:ppp_push+0x45c/0x620
Mar 3 15:21:14 vpn kernel: [ 0.000000] [<ffffffff8827b235>] :sch_htb:htb_safe_rb_erase+0x15/0x50
Mar 3 15:21:14 vpn kernel: [ 0.000000] [<ffffffff8827b635>] :sch_htb:htb_deactivate_prios+0x1a5/0x250
Mar 3 15:21:14 vpn kernel: [ 0.000000] [ppp_generic:ppp_xmit_process+0x469/0x640] :ppp_generic:ppp_xmit_process+0x469/0x640
Mar 3 15:21:14 vpn kernel: [ 0.000000] [ppp_generic:ppp_start_xmit+0x151/0x1e0] :ppp_generic:ppp_start_xmit+0x151/0x1e0
Mar 3 15:21:14 vpn kernel: [ 0.000000] [dev_hard_start_xmit+0x22c/0x2a0] dev_hard_start_xmit+0x22c/0x2a0
Mar 3 15:21:14 vpn kernel: [ 0.000000] [__qdisc_run+0x74/0x1f0] __qdisc_run+0x74/0x1f0
Mar 3 15:21:14 vpn kernel: [ 0.000000] [dev_queue_xmit+0x1e8/0x300] dev_queue_xmit+0x1e8/0x300
Mar 3 15:21:14 vpn kernel: [ 0.000000] [ip_rcv_finish+0x114/0x3b0] ip_rcv_finish+0x114/0x3b0
Mar 3 15:21:14 vpn kernel: [ 0.000000] [ip_rcv+0x212/0x300] ip_rcv+0x212/0x300
Mar 3 15:21:14 vpn kernel: [ 0.000000] [e1000:netif_receive_skb+0x3ac/0xd80] netif_receive_skb+0x3ac/0x490
Mar 3 15:21:14 vpn kernel: [ 0.000000] [<ffffffff8825c7a4>] :e1000:e1000_clean_rx_irq+0x1c4/0x590
Mar 3 15:21:14 vpn kernel: [ 0.000000] [<ffffffff88259609>] :e1000:e1000_clean+0x69/0x250
Mar 3 15:21:14 vpn kernel: [ 0.000000] [net_rx_action+0x128/0x230] net_rx_action+0x128/0x230
Mar 3 15:21:14 vpn kernel: [ 0.000000] [__do_softirq+0x75/0xe0] __do_softirq+0x75/0xe0
Mar 3 15:21:14 vpn kernel: [ 0.000000] [call_softirq+0x1c/0x30] call_softirq+0x1c/0x30
Mar 3 15:21:14 vpn kernel: [ 0.000000] <EOI> [pptp:_ack_timeout_work+0x0/0x20] :pptp:_ack_timeout_work+0x0/0x20
Mar 3 15:21:14 vpn kernel: [ 0.000000] [do_softirq+0x35/0x90] do_softirq+0x35/0x90
Mar 3 15:21:14 vpn kernel: [ 0.000000] [local_bh_enable_ip+0x54/0x60] local_bh_enable_ip+0x54/0x60
Mar 3 15:21:14 vpn kernel: [ 0.000000] [run_workqueue+0xcc/0x170] run_workqueue+0xcc/0x170
Mar 3 15:21:14 vpn kernel: [ 0.000000] [worker_thread+0x0/0x110] worker_thread+0x0/0x110
Mar 3 15:21:14 vpn kernel: [ 0.000000] [worker_thread+0x0/0x110] worker_thread+0x0/0x110
Mar 3 15:21:14 vpn kernel: [ 0.000000] [worker_thread+0xa3/0x110] worker_thread+0xa3/0x110
Mar 3 15:21:14 vpn kernel: [ 0.000000] [<ffffffff802543d0>] autoremove_wake_function+0x0/0x30
Mar 3 15:21:14 vpn kernel: [ 0.000000] [worker_thread+0x0/0x110] worker_thread+0x0/0x110
Mar 3 15:21:14 vpn kernel: [ 0.000000] [worker_thread+0x0/0x110] worker_thread+0x0/0x110
Mar 3 15:21:14 vpn kernel: [ 0.000000] [kthread+0x4b/0x80] kthread+0x4b/0x80
Mar 3 15:21:14 vpn kernel: [ 0.000000] [child_rip+0xa/0x12] child_rip+0xa/0x12
Mar 3 15:21:14 vpn kernel: [ 0.000000] [kthread+0x0/0x80] kthread+0x0/0x80
Mar 3 15:21:14 vpn kernel: [ 0.000000] [child_rip+0x0/0x12] child_rip+0x0/0x12
Mar 3 15:21:14 vpn kernel: [ 0.000000]

One of my CPUs goes 100% with ksoftirqd.

Latency increases signifcantly during this this (more than >100ms).

root@vpn:~# uname -a
Linux vpn 2.6.24-11-server #1 SMP Fri Feb 29 21:55:55 UTC 2008 x86_64 GNU/Linux

root@vpn:~# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E5335 @ 2.00GHz
stepping : 7
cpu MHz : 2000.020
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr dca lahf_lm
bogomips : 4002.47
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E5335 @ 2.00GHz
stepping : 7
cpu MHz : 2000.020
cache size : 4096 KB
physical id : 1
siblings : 4
core id : 0
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr dca lahf_lm
bogomips : 4000.12
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 2
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E5335 @ 2.00GHz
stepping : 7
cpu MHz : 2000.020
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 1
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr dca lahf_lm
bogomips : 4000.11
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 3
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E5335 @ 2.00GHz
stepping : 7
cpu MHz : 2000.020
cache size : 4096 KB
physical id : 1
siblings : 4
core id : 1
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr dca lahf_lm
bogomips : 4000.12
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 4
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E5335 @ 2.00GHz
stepping : 7
cpu MHz : 2000.020
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr dca lahf_lm
bogomips : 4000.10
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 5
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E5335 @ 2.00GHz
stepping : 7
cpu MHz : 2000.020
cache size : 4096 KB
physical id : 1
siblings : 4
core id : 2
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr dca lahf_lm
bogomips : 4000.12
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 6
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E5335 @ 2.00GHz
stepping : 7
cpu MHz : 2000.020
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr dca lahf_lm
bogomips : 4000.09
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 7
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Xeon(R) CPU E5335 @ 2.00GHz
stepping : 7
cpu MHz : 2000.020
cache size : 4096 KB
physical id : 1
siblings : 4
core id : 3
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx tm2 ssse3 cx16 xtpr dca lahf_lm
bogomips : 4000.11
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:


I've also this tweaks:

ethtool -G eth0 tx 4096 rx 4096
ethtool -G eth1 tx 4096 rx 4096

echo "8192" > /proc/sys/vm/min_free_kbytes

I attached IRQ to different CPUs by:
/bin/echo "0f" > /proc/irq/2297/smp_affinity
/bin/echo "f0" > /proc/irq/2296/smp_affinity

root@vpn:~# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7
0: 72 0 0 0 0 0 0 0 XT-PIC-XT timer
1: 2 0 0 0 0 0 0 0 XT-PIC-XT i8042
2: 0 0 0 0 0 0 0 0 XT-PIC-XT cascade
8: 1 0 0 0 0 0 0 0 XT-PIC-XT rtc
11: 9117 0 0 0 0 0 0 0 XT-PIC-XT aic94xx
14: 84 0 0 0 0 0 0 0 XT-PIC-XT libata
15: 0 0 0 0 0 0 0 0 XT-PIC-XT libata
2296: 76853 76976 76639 76692 248073 247957 248079 248084 PCI-MSI-edge eth1
2297: 266795 266672 267009 266956 93920 94035 93914 93908 PCI-MSI-edge eth0
NMI: 0 0 0 0 0 0 0 0 Non-maskable interrupts
LOC: 965013 834094 867750 727089 1455650 1345845 1455953 1448724 Local timer interrupts
RES: 1628 1810 1571 1677 2155 2423 1696 1790 Rescheduling interrupts
CAL: 23430 23462 20406 20090 23243 23379 19260 19203 function call interrupts
TLB: 3343 3501 2107 2142 3994 3626 1680 1826 TLB shootdowns
TRM: 0 0 0 0 0 0 0 0 Thermal event interrupts
THR: 0 0 0 0 0 0 0 0 Threshold APIC interrupts
SPU: 0 0 0 0 0 0 0 0 Spurious interrupts
ERR: 0

ifconfig eth0 txqueuelen 1000
ifconfig eth1 txqueuelen 1000

I wanted to switch to e1000e driver instead of e1000 as I've in kernel:

CONFIG_E1000=m
CONFIG_E1000E=m
# CONFIG_E1000_DISABLE_PACKET_SPLIT is not set
CONFIG_E1000_NAPI=y

I'm trying to load it by:
modprobe -r e1000; modprobe e1000e; /etc/init.d/networking restart

but NICs aren't detected :(

Why so?

I have (lspci -vvv output):

06:00.0 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01)
Subsystem: Super Micro Computer Inc Unknown device 0000
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 2297
Region 0: Memory at d8300000 (32-bit, non-prefetchable) [size=128K]
Region 2: I/O ports at 3000 [size=32]
Capabilities: [c8] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [d0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable+
Address: 00000000fee0f00c Data: 41b9
Capabilities: [e0] Express Endpoint IRQ 0
Device: Supported: MaxPayload 256 bytes, PhantFunc 0, ExtTag-
Device: Latency L0s <512ns, L1 <64us
Device: AtnBtn- AtnInd- PwrInd-
Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
Device: MaxPayload 128 bytes, MaxReadReq 512 bytes
Link: Supported Speed 2.5Gb/s, Width x4, ASPM unknown, Port 0
Link: Latency L0s <128ns, L1 <64us
Link: ASPM Disabled RCB 64 bytes CommClk- ExtSynch-
Link: Speed 2.5Gb/s, Width x4

06:00.1 Ethernet controller: Intel Corporation 80003ES2LAN Gigabit Ethernet Controller (Copper) (rev 01)
Subsystem: Super Micro Computer Inc Unknown device 0000
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 32 bytes
Interrupt: pin B routed to IRQ 2296
Region 0: Memory at d8320000 (32-bit, non-prefetchable) [size=128K]
Region 2: I/O ports at 3020 [size=32]
Capabilities: [c8] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [d0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable+
Address: 00000000feef000c Data: 41c1
Capabilities: [e0] Express Endpoint IRQ 0
Device: Supported: MaxPayload 256 bytes, PhantFunc 0, ExtTag-
Device: Latency L0s <512ns, L1 <64us
Device: AtnBtn- AtnInd- PwrInd-
Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
Device: MaxPayload 128 bytes, MaxReadReq 512 bytes
Link: Supported Speed 2.5Gb/s, Width x4, ASPM unknown, Port 0
Link: Latency L0s <128ns, L1 <64us
Link: ASPM Disabled RCB 64 bytes CommClk- ExtSynch-
Link: Speed 2.5Gb/s, Width x4

So I still have to use e1000 with InterruptThrottleRate=0,0 RxIntDelay=0,0 RxAbsIntDelay=0,0 TxIntDelay=0,0 TxAbsIntDelay=0,0:

Mar 3 08:36:29 vpn kernel: [ 0.000000] Intel(R) PRO/1000 Network Driver - version 7.3.20-k2-NAPI
Mar 3 08:36:29 vpn kernel: [ 0.000000] Copyright (c) 1999-2006 Intel Corporation.
Mar 3 08:36:29 vpn kernel: [ 0.000000] PCI: Found IRQ 11 for device 0000:06:00.0
Mar 3 08:36:29 vpn kernel: [ 0.000000] PCI: Sharing IRQ 11 with 0000:00:1f.1
Mar 3 08:36:29 vpn kernel: [ 0.000000] PCI: Sharing IRQ 11 with 0000:0b:01.0
Mar 3 08:36:29 vpn kernel: [ 0.000000] PCI: Setting latency timer of device 0000:06:00.0 to 64
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.0: e1000_validate_option: Transmit Interrupt Delay set to 0
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.0: e1000_validate_option: Transmit Absolute Interrupt Delay set to 0
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.0: e1000_validate_option: Receive Interrupt Delay set to 0
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.0: e1000_validate_option: Receive Absolute Interrupt Delay set to 0
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.0: e1000_check_options: Interrupt Throttling Rate (ints/sec) turned off
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.0: e1000_probe: (PCI Express:2.5Gb/s:Width x4) 00:30:48:34:8f:36
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: eth0: e1000_probe: Intel(R) PRO/1000 Network Connection
Mar 3 08:36:29 vpn kernel: [ 0.000000] PCI: Found IRQ 10 for device 0000:06:00.1
Mar 3 08:36:29 vpn kernel: [ 0.000000] PCI: Sharing IRQ 10 with 0000:00:1f.3
Mar 3 08:36:29 vpn kernel: [ 0.000000] PCI: Setting latency timer of device 0000:06:00.1 to 64
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.1: e1000_validate_option: Transmit Interrupt Delay set to 0
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.1: e1000_validate_option: Transmit Absolute Interrupt Delay set to 0
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.1: e1000_validate_option: Receive Interrupt Delay set to 0
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.1: e1000_validate_option: Receive Absolute Interrupt Delay set to 0
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.1: e1000_check_options: Interrupt Throttling Rate (ints/sec) turned off
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: 0000:06:00.1: e1000_probe: (PCI Express:2.5Gb/s:Width x4) 00:30:48:34:8f:37
Mar 3 08:36:29 vpn kernel: [ 0.000000] e1000: eth1: e1000_probe: Intel(R) PRO/1000 Network Connection
Mar 3 08:36:35 vpn kernel: [ 0.000000] e1000: eth0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX

--
Oleksandr Samoylyk
OVS-RIPE
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