Server 2k8 r2: UDP traffic from over 30K IPs causing tcpip.sys to contend on spinlocks resulting in 1/2 second DPCs. Works fine in Win2k3.
We have a UDP server that accepts many connections. In Win2k3 it can talk to anywhere from 90K to 120K IP addresses with no problem.
On Win2k8R2 it throttles and often tips over at 30K users.
I have xperf logs showing the problems. DPCs start out taking reasonable amounts of time, but eventually grow to take half a second upwards of 3/4 of a second; at that point the network stack seems to tip over and start again.
I've appended some of the xperf data. I don't see a way to provide an attachment.
The nic is the Intel 82576 with only one link active. Again - same code same hardware runs fine on win2k3.
There are various routes to it, but huge swaths of code always end up in: NDIS.SYS!NdisAcquireReadWriteLock.
I would assume on the same lock, and I would guess it's a spin lock since it spends all its time in ntkrnlmp.exe!KeAcquireSpinLockAtDpcLevel.
In our sample the process had a weight of 540,714 units. Of that at least 210,597 ended up trying to acquire that lock via WSASendTo. Gory details appended.
From the DPC view, you can see the calls that were taking 1/2 a second or longer. There are 110 of them in a 37 second sample. The time to process varies randomly and there are many thousands in between. This is appended as the second set
of voluminous data.
OS is Win2k R2 SP1
The Intel 82576 NIC has the latest available drivers
I've already tried altering just about every network parameter to observe the results. RSS enabled/disabled. RSS NIC configured for 1 or more CPUs. Various timings for Interrupt deferral, etc...
The net effect of all this was that I could move the shape of the curves, and even stop the network from tipping over entirely; however the DPC times are still awful; the spinlocks are still spinning and the net throughput is still 1/4 of Win2k3.
Any suggestions? What's the next step?
Joe
Stack
Weight
% Weight
Count
| | | | | |- ws2_32.dll!WSASendTo
210597.1896
5.33
210735
| | | | | | |- mswsock.dll!WSPSendTo
210222.4585
5.32
210356
| | | | | | | |- ntdll.dll!ZwDeviceIoControlFile
209948.2971
5.31
210079
| | | | | | | | ntdll.dll!LdrInitializeThunk
209948.2971
5.31
210079
| | | | | | | | ntdll.dll! ?? ::FNODOBFM::`string'
209948.2971
5.31
210079
| | | | | | | | wow64.dll!Wow64LdrpInitialize
209948.2971
5.31
210079
| | | | | | | | wow64.dll!RunCpuSimulation
209948.2971
5.31
210079
| | | | | | | | wow64cpu.dll!DeviceIoctlFileFault
209948.2971
5.31
210079
| | | | | | | | wow64cpu.dll!CpupSyscallStub
209948.2971
5.31
210079
| | | | | | | | |- ntkrnlmp.exe!KiSystemServiceCopyEnd
209865.9437
5.31
209996
| | | | | | | | | |- ntkrnlmp.exe!NtDeviceIoControlFile
209861.9414
5.31
209992
| | | | | | | | | | |- ntkrnlmp.exe!IopXxxControlFile
209856.0089
5.31
209986
| | | | | | | | | | | |- afd.sys!AfdFastIoDeviceControl
209456.9132
5.3
209583
| | | | | | | | | | | | |- afd.sys!AfdFastDatagramSend
209323.6618
5.3
209448
| | | | | | | | | | | | | |- afd.sys!AfdTLFastDgramSend
208405.7464
5.27
208521
| | | | | | | | | | | | | | |- tcpip.sys!UdpTlProviderSendMessages
208270.0504
5.27
208384
| | | | | | | | | | | | | | | |- ntkrnlmp.exe!KeExpandKernelStackAndCalloutEx
208216.8802
5.27
208330
| | | | | | | | | | | | | | | | |- tcpip.sys!UdpTlProviderSendMessagesCalloutRoutine
208164.7757
5.27
208277
| | | | | | | | | | | | | | | | | |- tcpip.sys!UdpSendMessages
208158.8001
5.27
208271
| | | | | | | | | | | | | | | | | | |- tcpip.sys!UdpSendMessagesOnPathCreation
204713.1138
5.18
204823
| | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpAleFastUdpInspection
127845.6429
3.23
127912
| | | | | | | | | | | | | | | | | | | | |- NDIS.SYS!NdisAcquireReadWriteLock
127041.047
3.21
127099
| | | | | | | | | | | | | | | | | | | | |- ntkrnlmp.exe!RtlLookupEntryHashTable
264.272245
0.01
267
| | | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpAleFastUdpInspection<itself>
171.42808
0
173
| | | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpAlepIsSameEndpoint
131.641229
0
133
| | | | | | | | | | | | | | | | | | | | |- netio.sys!WfpRefreshEntryLru
125.181435
0
126
| | | | | | | | | | | | | | | | | | | | |- tcpip.sys!memset
39.508324
0
40
| | | | | | | | | | | | | | | | | | | | |- netio.sys!KfdIsLayerEmpty
30.500205
0
31
| | | | | | | | | | | | | | | | | | | | |- netio.sys!KfdGetLayerCacheEpoch
18.334937
0
19
| | | | | | | | | | | | | | | | | | | | |- NDIS.SYS!NdisReleaseReadWriteLock
15.799406
0
16
| | | | | | | | | | | | | | | | | | | | |- ntkrnlmp.exe! ?? ::FNODOBFM::`string'
3.992942
0
4
| | | | | | | | | | | | | | | | | | | | |- tcpip.sys!KfdIsLayerEmpty
3.937052
0
4
| | | | | | | | | | | | | | | | | | | |- tcpip.sys!IpNlpFastSendDatagram
63245.49252
1.6
63271
| | | | | | | | | | | | | | | | | | | | |- tcpip.sys!IppSendDatagramsCommon
62205.09904
1.57
62216
| | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpProcessOutTransportStackIndication
61667.95687
1.56
61676
| | | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!ProcessALEForTransportPacket
61615.13818
1.56
61623
| | | | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpAleMatchStatefulEndpoint
50338.28726
1.27
50346
| | | | | | | | | | | | | | | | | | | | | | | | |- NDIS.SYS!NdisAcquireReadWriteLock
50260.6444
1.27
50268
| | | | | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpAleMatchStatefulEndpoint<itself>
31.797626
0
32
| | | | | | | | | | | | | | | | | | | | | | | | |- ntkrnlmp.exe!RtlLookupEntryHashTable
20.90588
0
21
| | | | | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpAlepIsSameEndpoint
8.997452
0
9
| | | | | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!memset
8.940707
0
9
| | | | | | | | | | | | | | | | | | | | | | | | |- netio.sys!WfpRefreshEntryLru
2.999293
0
3
| | | | | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!_security_check_cookie
2.001804
0
2
| | | | | | | | | | | | | | | | | | | | | | | | |- NDIS.SYS!NdisReleaseReadWriteLock
2.000098
0
2
| | | | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpAleConnectAcceptIndicate
11225.06641
0.28
11225
| | | | | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpAleAuthorizeSend
11219.07252
0.28
11219
| | | | | | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpAlepAuthorizeSend
11208.09459
0.28
11208
| | | | | | | | | | | | | | | | | | | | | | | | | | |- tcpip.sys!WfpAleInsertRemoteEndpoint
11035.14208
0.28
11035
| | | | | | | | | | | | | | | | | | | | | | | | | | | |- NDIS.SYS!NdisAcquireReadWriteLock
10873.02754
0.28
10873
DPC Raw Info:
Function
Count
Max Actual Duration (ms)
ndisInterruptDpc
554751
713.847
1
713.847
1
708.4239
1
677.1281
1
672.813
1
672.2575
1
660.812
1
660.0321
1
655.2213
1
647.1885
1
641.3311
1
632.4002
1
622.6813
1
621.7657
1
620.5844
1
617.5036
1
615.4015
1
610.9474
1
606.8938
1
604.7577
1
594.5486
1
587.6109
1
581.5086
1
580.0222
1
579.7739
1
576.6219
1
576.4333
1
575.1572
1
574.4537
1
574.1743
1
573.7621
1
560.8745
1
559.7798
1
557.8415
1
557.8143
1
557.5373
1
553.3025
1
553.172
1
550.6415
1
549.8416
1
549.612
1
549.5203
1
548.3752
1
548.0821
1
547.8116
1
547.4588
1
547.2672
1
545.9869
1
544.6088
1
544.3772
1
542.6019
1
542.4782
1
542.2717
1
542.2666
1
542.2051
1
540.3364
1
538.9678
1
538.8142
1
538.3009
1
537.85
1
535.7837
1
534.7581
1
534.7572
1
532.4798
1
532.2034
1
532.0741
1
531.8791
1
530.7899
1
529.894
1
528.7522
1
527.006
1
526.6041
1
526.3972
1
525.4709
1
525.351
1
524.2444
1
522.7439
1
521.5258
1
520.562
1
520.4451
1
518.5009
1
517.4765
1
517.375
1
517.282
1
512.0087
1
511.5543
1
511.5373
1
510.6021
1
509.3328
1
508.7159
1
507.1279
1
505.7661
1
505.1325
1
504.612
1
501.9754
1
501.9476
1
501.94
1
500.7436
1
500.625
1
500.5376
1
499.567
1
499.5614
1
499.36
1
499.2837
1
499.0861
1
499.0537
1
498.7743
1
498.4466
1
498.3967
1
496.5591
1
495.4409
Joe Rohde
Hi Joe,
The issue can be checked only by dump file. In this scenario, we may have to capture the dump file and MPS reports to analysis. I am afraid
that your issue falls into the paid support category which requires a more in-depth level of support. Please visit the below link to see the various paid support options that are available to better meet your needs.
http://support.microsoft.com/default.aspx?id=fh;en-us;offerprophone
Thanks for your understanding and efforts with the issue.
Annie
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But it breaks DNS resolution from inside. If I add the above command and try to nslookup from inside to an outside DNS server
64.90.175.90, DNS times out. If I remove the above nat command, it works again. It seems like even though DNS UDP originates from inside which should create a statefull connection, ASA still messes with return DNS responses.
I then tried to create an "exclusion" for that IP with the following:
object-group network nat-exclusions
network-object host 64.90.175.90
nat (outside,inside) source static nat-exclusions nat-exclusions
but it's not working.
I also tried:
nat (outside,inside) source static nat-exclusions nat-exclusions unidirectional
Also not working.
Any suggestions? How can outside-PAT all UDP traffic excluding DNS.TAC was able to help. I needed this:
object network exclusions
host 64.90.175.90
nat (inside,outside) source dynamic any interface destination static exclusions exclusions
nat (outside,inside) source dynamic any obj-10.0.0.173 service udp udp
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