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Date: Mon, 02 Feb 2009 11:13:19 -0500
From: Kenny Chang <kchang@...enacr.com>
To: netdev@...r.kernel.org
Subject: Re: Multicast packet loss
Neil Horman wrote:
> On Fri, Jan 30, 2009 at 11:41:23PM +0100, Eric Dumazet wrote:
>
>> Kenny Chang a écrit :
>>
>>> Ah, sorry, here's the test program attached.
>>>
>>> We've tried 2.6.28.1, but no, we haven't tried the 2.6.28.2 or the
>>> 2.6.29.-rcX.
>>>
>>> Right now, we are trying to step through the kernel versions until we
>>> see where the performance drops significantly. We'll try 2.6.29-rc soon
>>> and post the result.
>>>
>> 2.6.29-rc contains UDP receive improvements (lockless)
>>
>> Problem is multicast handling was not yet updated, but could be :)
>>
>>
>> I was asking you "cat /proc/interrupts" because I believe you might
>> have a problem NIC interrupts being handled by one CPU only (when having problems)
>>
>>
> That would be expected (if irqbalance is running), and desireable, since
> spreading high volume interrupts like NICS accross multiple cores (or more
> specifically multiple L2 caches), is going increase your cache line miss rate
> significantly and decrease rx throughput.
>
> Although you do have a point here, if the system isn't running irqbalance, and
> the NICS irq affinity is spread accross multiple L2 caches, that would be a
> point of improvement performance-wise.
>
> Kenny, if you could provide the /proc/interrupts info along with /proc/cpuinfo
> and your stats that I asked about earlier, that would be a big help.
>
> Regards
> Neil
>
>
Hi Neil,
Here's the information you requested.
Kenny
kchang@...st8:~$ uname -a
Linux beast8 2.6.24-19-server #1 SMP Wed Aug 20 18:43:06 UTC 2008 x86_64
GNU/Linux
kchang@...st8:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU L5430 @ 2.66GHz
stepping : 10
cpu MHz : 2659.999
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 13
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
lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx
est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm
bogomips : 5322.91
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU L5430 @ 2.66GHz
stepping : 10
cpu MHz : 2659.999
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 1
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 13
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
lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx
est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm
bogomips : 5320.03
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
processor : 2
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU L5430 @ 2.66GHz
stepping : 10
cpu MHz : 2659.999
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 13
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
lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx
est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm
bogomips : 5320.06
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
processor : 3
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU L5430 @ 2.66GHz
stepping : 10
cpu MHz : 2659.999
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 13
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
lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx
est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm
bogomips : 5320.06
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
processor : 4
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU L5430 @ 2.66GHz
stepping : 10
cpu MHz : 2659.999
cache size : 6144 KB
physical id : 1
siblings : 4
core id : 0
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 13
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
lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx
est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm
bogomips : 5320.07
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
processor : 5
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU L5430 @ 2.66GHz
stepping : 10
cpu MHz : 2659.999
cache size : 6144 KB
physical id : 1
siblings : 4
core id : 1
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 13
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
lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx
est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm
bogomips : 5320.07
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
processor : 6
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU L5430 @ 2.66GHz
stepping : 10
cpu MHz : 2659.999
cache size : 6144 KB
physical id : 1
siblings : 4
core id : 2
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 13
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
lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx
est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm
bogomips : 5320.08
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
processor : 7
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU L5430 @ 2.66GHz
stepping : 10
cpu MHz : 2659.999
cache size : 6144 KB
physical id : 1
siblings : 4
core id : 3
cpu cores : 4
fpu : yes
fpu_exception : yes
cpuid level : 13
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
lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx
est tm2 ssse3 cx16 xtpr dca sse4_1 lahf_lm
bogomips : 5320.08
clflush size : 64
cache_alignment : 64
address sizes : 38 bits physical, 48 bits virtual
power management:
kchang@...st8:~$ cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 CPU4
CPU5 CPU6 CPU7
0: 67 0 1 0 0
0 0 0 IO-APIC-edge timer
1: 0 0 0 0 0
0 0 0 IO-APIC-edge i8042
8: 0 0 0 1 0
0 0 0 IO-APIC-edge rtc
9: 0 0 0 0 0
0 0 0 IO-APIC-fasteoi acpi
14: 12 13 13 13 12
10 13 13 IO-APIC-edge libata
15: 0 0 0 0 0
0 0 0 IO-APIC-edge libata
17: 294 295 293 294 294
296 293 288 IO-APIC-fasteoi aacraid
22: 6 5 5 5 6
6 6 6 IO-APIC-fasteoi uhci_hcd:usb3
23: 7 8 8 7 7
8 7 8 IO-APIC-fasteoi ehci_hcd:usb1,
uhci_hcd:usb2, uhci_hcd:usb4
2294: 48 46 48 48 49
47 48 51 PCI-MSI-edge eth0
NMI: 0 0 0 0 0
0 0 0 Non-maskable interrupts
LOC: 5088 3394 3129 2835 2561
2938 2576 2798 Local timer interrupts
RES: 59 119 58 36 34
71 50 17 Rescheduling interrupts
CAL: 132 128 149 141 138
140 152 140 function call interrupts
TLB: 285 178 278 183 297
191 295 157 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
--
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