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Old 11-02-2011, 11:33 AM
Benjamin
 
Default Packet loss problem and some questions related with OS

Hi All,



I have some doubts , please clear me.





Query 1 ) should we set irq afinity of pci lan interface or onboard
lan interface or we can do for both ?



Query 2) H/w must be APIC enabled and for them only we can do set
irq afinity , is it so?



Query 3) What are the root cause for packet loss on interface ?



Actually in one of my server , i m having strange result, i can not
see any value update for lan interface in interrupts.



cat /proc/interrupts

********** CPU0****** CPU1****** CPU2****** CPU3******

* 0:******* 124********* 0********* 0******** 78** IO-APIC-edge*****
timer

* 1:********* 0********* 0********* 0******* 614** IO-APIC-edge*****
i8042

* 8:********* 0********* 0********* 0********* 1** IO-APIC-edge*****
rtc0

* 9:********* 0********* 0********* 0********* 0** IO-APIC-fasteoi**
acpi

*12:********* 0********* 0********* 0******* 159** IO-APIC-edge*****
i8042

*19:********* 0***** 13411********* 0********* 0** IO-APIC-fasteoi**
ata_piix, ata_piix

*21:********* 0********* 0******** 70********* 0** IO-APIC-fasteoi**
ehci_hcd:usb1

*23:********* 0********* 0******** 32********* 0** IO-APIC-fasteoi**
ehci_hcd:usb2

*40:**** 229974********* 0********* 0********* 0* HPET_MSI-edge*****
hpet2

*41:********* 0***** 85867********* 0********* 0* HPET_MSI-edge*****
hpet3

*42:********* 0********* 0***** 73987********* 0* HPET_MSI-edge*****
hpet4

*43:********* 0********* 0********* 0**** 106848* HPET_MSI-edge*****
hpet5

*45:********* 0********* 0********* 0********* 0** PCI-MSI-edge*****
aerdrv, PCIe PME

*46:********* 0********* 0********* 0********* 0** PCI-MSI-edge*****
aerdrv, PCIe PME

*47:********* 0********* 0********* 0********* 0** PCI-MSI-edge*****
PCIe PME

*48:********* 0********* 0********* 0********* 0** PCI-MSI-edge*****
PCIe PME

*49:********* 0********* 0********* 0********* 0** PCI-MSI-edge*****
PCIe PME

*50:********* 0********* 0********* 0**** 219714** PCI-MSI-edge*****


*51:***** 10880********* 0********* 0********* 0** PCI-MSI-edge*****


*52:********* 4********* 0********* 0********* 0**
PCI-MSI-edge***** em1

NMI:******** 44******** 16********* 8******** 29** Non-maskable
interrupts

LOC:******* 282******* 248******* 158******** 68** Local timer
interrupts

SPU:********* 0********* 0********* 0********* 0** Spurious
interrupts

PMI:******** 44******** 16********* 8******** 29** Performance
monitoring interrupts

IWI:********* 0********* 0********* 0********* 0** IRQ work
interrupts

RES:****** 6283****** 2718****** 2153****** 5353** Rescheduling
interrupts

CAL:******* 128******* 100******* 228******* 278** Function call
interrupts

TLB:******** 15******** 33******** 12******** 22** TLB shootdowns

TRM:********* 0********* 0********* 0********* 0** Thermal event
interrupts

THR:********* 0********* 0********* 0********* 0** Threshold APIC
interrupts

MCE:********* 0********* 0********* 0********* 0** Machine check
exceptions

MCP:******** 78******** 78******** 78******** 78** Machine check
polls

ERR:********* 0

MIS:********* 0





em1 is my lan interface.



ifconfig

em1****** Link encap:Ethernet* HWaddr 00:25:90:0A:E6:A2*

********* inet addr:192.168.100.152* Bcast:192.168.100.255*
Mask:255.255.255.0

********* inet6 addr: fe80::225:90ff:fe0a:e6a2/64 Scope:Link

********* UP BROADCAST RUNNING MULTICAST* MTU:1500* Metric:1

********* RX packets:216457 errors:0 dropped:16064
overruns:0 frame:0

********* TX packets:12715 errors:0 dropped:0 overruns:0 carrier:0

********* collisions:0 txqueuelen:1000

********* RX bytes:36976063 (35.2 MiB)* TX bytes:2391031 (2.2 MiB)

********* Interrupt:16 Memory:fb5e0000-fb600000



lo******* Link encap:Local Loopback*

********* inet addr:127.0.0.1* Mask:255.0.0.0

********* inet6 addr: ::1/128 Scope:Host

********* UP LOOPBACK RUNNING* MTU:16436* Metric:1

********* RX packets:0 errors:0 dropped:0 overruns:0 frame:0

********* TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

********* collisions:0 txqueuelen:0

********* RX bytes:0 (0.0 b)* TX bytes:0 (0.0 b)







But i can not see any 16 irq no. in cat /proc/interrupts.



I tried to increase rx and tx for em1 but still same i m having
packet loss on interface.



OS : fedora 15 64 bit.



04:00.0 Ethernet controller: Intel Corporation 82574L Gigabit
Network Connection

05:00.0 Ethernet controller: Intel Corporation 82574L Gigabit
Network Connection



Kernel : 2.6.40.6-0.fc15.x86_64





Please guide me to solve this issues and resolve my queries.





Warm Regards,

Benjamin







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