[c-nsp] High latency/jitter at times on a NPE-G1?
Sean Watkins
sean at northrock.bm
Thu Jun 1 09:25:26 EDT 2006
Hi
>
> If you want to prove it put a sniffer/analyzer on both sides
> of the box and time sync the traces.
Ok good idea.
>
> That is just about the ONLY way you can 100% prove the box is
> introducing latency/jitter in the forwarding stream.
>
> There will always be some latency/jitter but it should be so
> small it's irrelevant.
>
> What order of magnitude are you talking about?
300 Ms at times.
>
> TAC will have an extremely hard time solving this problem
> unless you can prove with a trace when and how much latency
> the box is really introducing.
>
> I'd be very amazed if it's the 72xx because it's software
> forwarding and once the packet goes in the switching vector
> it can't be held up other than if there is congestion for the
> most part.
Interesting. I figured as the box is software forwarding, it was open to a
whole host latency issues?
I've seen at times, on software based platforms, TFTP kill the performance
of the box? Even with CEF?
>
> Just curious:
>
> can you post a 'sh c7200' output.
>
Attached below
Network IO Interrupt Throttling:
throttle count=0, timer count=0
active=0, configured=0
netint usec=4000, netint mask usec=200
Midplane EEPROM:
Hardware revision 2.1 Board revision B0
Serial number 21298919 Part number 73-3223-05
Test history 0x0 RMA number 00-00-00
MAC Pool Size 1024 MAC Addr Base 0005.9aee.1000
Chassis Model 0x6
EEPROM format version 1
EEPROM contents (hex):
0x00: 01 06 02 01 01 44 FE E7 49 0C 97 05 00 05 9A EE
0x10: 10 00 04 00 00 00 00 00 00 10 30 58 00 00 FF 00
0x20: 00 00 00 00 62 DA 42 DC 62 C6 00 00 60 85 C8 00
0x30: 62 D3 00 00 00 00 00 00 00 00 00 00 62 DA 42 DC
C7206VXR CPU EEPROM:
Hardware Revision : 2.1
Top Assy. Part Number : 800-18896-12
Part Number : 73-6988-12
Board Revision : A0
PCB Serial Number : 34615042
RMA History : 00
Fab Version : 09
Fab Part Number : 28-5082-09
Product (FRU) Number : NPE-G1
Deviation Number : 0-0
EEPROM format version 4
EEPROM contents (hex):
0x00: 04 FF 40 03 5B 41 02 01 C0 46 03 20 00 49 D0 0C
0x10: 82 49 1B 4C 0C 42 41 30 C1 8B 33 34 36 31 35 30
0x20: 34 32 00 00 00 04 00 02 09 85 1C 13 DA 09 CB 86
0x30: 4E 50 45 2D 47 31 80 00 00 00 00 FF FF FF FF FF
0x40: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x50: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x60: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
0x70: FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
TLB entries (50/64 used):
Virt Address range Phy Address range Attributes
0x4B000000:0x4B1FFFFF 0x14B000000:0x14B1FFFFF CacheMode=2, RW, Invalid
0x4B200000:0x4B3FFFFF 0x14B200000:0x14B3FFFFF CacheMode=2, RW, Invalid
0x10000000:0x10001FFF 0x0FC010000:0x0FC011FFF CacheMode=2, RW, Valid
0x42000000:0x43FFFFFF 0x062000000:0x063FFFFFF CacheMode=2, RW, Valid
0x46000000:0x47FFFFFF 0x066000000:0x067FFFFFF CacheMode=2, RW, Valid
0x3C000000:0x3C7FFFFF 0x068000000:0x0687FFFFF CacheMode=2, RW, Valid
0x3C800000:0x3CFFFFFF 0x068800000:0x068FFFFFF CacheMode=2, RW, Invalid
0x3D000000:0x3D7FFFFF 0x06D000000:0x06D7FFFFF CacheMode=2, RW, Invalid
0x3D800000:0x3DFFFFFF 0x069000000:0x0697FFFFF CacheMode=2, RW, Valid
0x3E000000:0x3E7FFFFF 0x06D800000:0x06DFFFFFF CacheMode=2, RW, Invalid
0x3E800000:0x3EFFFFFF 0x069800000:0x069FFFFFF CacheMode=2, RW, Invalid
0x3F000000:0x3F7FFFFF 0x06E000000:0x06E7FFFFF CacheMode=2, RW, Invalid
0x1FC00000:0x1FC7FFFF 0x01FC00000:0x01FC7FFFF CacheMode=2, RO, Valid
0x1E000000:0x1E7FFFFF 0x01E000000:0x01E7FFFFF CacheMode=2, RW, Valid
0x1E800000:0x1E9FFFFF 0x01E800000:0x01E9FFFFF CacheMode=2, RW, Valid
0x60000000:0x607FFFFF 0x000000000:0x0007FFFFF CacheMode=5, RO, Valid
0x60800000:0x60FFFFFF 0x000800000:0x000FFFFFF CacheMode=5, RO, Valid
0x61000000:0x617FFFFF 0x001000000:0x0017FFFFF CacheMode=5, RO, Valid
0x61800000:0x619FFFFF 0x001800000:0x0019FFFFF CacheMode=5, RO, Valid
0x61A00000:0x61A1FFFF 0x001A00000:0x001A1FFFF CacheMode=5, RO, Valid
0x61A20000:0x61A3FFFF 0x001A20000:0x001A3FFFF CacheMode=5, RO, Valid
0x61A40000:0x61A47FFF 0x001A40000:0x001A47FFF CacheMode=5, RO, Valid
0x61A48000:0x61A4FFFF 0x001A48000:0x001A4FFFF CacheMode=5, RO, Valid
0x61A50000:0x61A57FFF 0x001A50000:0x001A57FFF CacheMode=5, RO, Valid
0x61A58000:0x61A5FFFF 0x001A58000:0x001A5FFFF CacheMode=5, RW, Valid
0x61A60000:0x61A7FFFF 0x001A60000:0x001A7FFFF CacheMode=5, RW, Valid
0x61A80000:0x61AFFFFF 0x001A80000:0x001AFFFFF CacheMode=5, RW, Valid
0x61B00000:0x61B7FFFF 0x001B00000:0x001B7FFFF CacheMode=5, RW, Valid
0x61B80000:0x61BFFFFF 0x001B80000:0x001BFFFFF CacheMode=5, RW, Valid
0x61C00000:0x61DFFFFF 0x001C00000:0x001DFFFFF CacheMode=5, RW, Valid
0x61E00000:0x61FFFFFF 0x001E00000:0x001FFFFFF CacheMode=5, RW, Valid
0x62000000:0x63FFFFFF 0x002000000:0x003FFFFFF CacheMode=5, RW, Valid
0x64000000:0x65FFFFFF 0x004000000:0x005FFFFFF CacheMode=5, RW, Valid
0x66000000:0x67FFFFFF 0x006000000:0x007FFFFFF CacheMode=5, RW, Valid
0x68000000:0x69FFFFFF 0x008000000:0x009FFFFFF CacheMode=5, RW, Valid
0x6A000000:0x6BFFFFFF 0x00A000000:0x00BFFFFFF CacheMode=5, RW, Valid
0x6C000000:0x6DFFFFFF 0x080000000:0x081FFFFFF CacheMode=5, RW, Valid
0x6E000000:0x6FFFFFFF 0x082000000:0x083FFFFFF CacheMode=5, RW, Valid
0x70000000:0x71FFFFFF 0x084000000:0x085FFFFFF CacheMode=5, RW, Valid
0x72000000:0x73FFFFFF 0x086000000:0x087FFFFFF CacheMode=5, RW, Valid
0x74000000:0x75FFFFFF 0x088000000:0x089FFFFFF CacheMode=5, RW, Valid
0x76000000:0x77FFFFFF 0x08A000000:0x08BFFFFFF CacheMode=5, RW, Valid
0x78000000:0x79FFFFFF 0x08C000000:0x08DFFFFFF CacheMode=5, RW, Valid
0x7A000000:0x7BFFFFFF 0x08E000000:0x08FFFFFFF CacheMode=5, RW, Valid
0x0C000000:0x0DFFFFFF 0x00C000000:0x00DFFFFFF CacheMode=5, RW, Valid
0x0E000000:0x0FFFFFFF 0x00E000000:0x00FFFFFFF CacheMode=5, RW, Valid
0x50000000:0x57FFFFFF 0x090000000:0x097FFFFFF CacheMode=5, RW, Valid
0x58000000:0x5FFFFFFF 0x098000000:0x09FFFFFFF CacheMode=5, RW, Valid
0x20000000:0x27FFFFFF 0x0C0000000:0x0C7FFFFFF CacheMode=5, RW, Valid
0x28000000:0x2FFFFFFF 0x0C8000000:0x0CFFFFFFF CacheMode=5, RW, Valid
It is normal operation to have both Valid and Invalid TLB entries.
System was restarted by power-on at 22:14:02 UTC Sun Apr 9 2000
0 spurious cache errors detected.
System Controller Network Interrupts
Wrapper is INSTALLED at address 0x60864730
Interrupt Register is at 0xB0020040 (0x0000000000000000)
Registered Interrupts:
Level Mask Count Data Interrupt Handler
0 0x0000000000200000 0 0x500564FC 0x6015E3E8
(GigabitEthernet0/3)
0 0x0000000000100000 216336 0x50044540 0x6015E3E8
(GigabitEthernet0/2)
0 0x0000000000080000 2299926 0x62D56430 0x6015E3E8
(GigabitEthernet0/1)
1 0x0000000800000000 7 0x00000000 0x6015EAB8 (SBETH media
interrupt)
1 0x0000000000001000 690 0x00000000 0x60864BC8 (BCM-1250 PCMCIA)
2 0x0000000000000020 0 0x62D43690 0x6086505C (SB1250 Timer 3)
2 0x0000000000000010 0 0x62D435E0 0x6086505C (SB1250 Timer 2)
2 0x0000000000000008 0 0x62D43530 0x6086505C (SB1250 Timer 1)
2 0x0000000000000004 0 0x62D43480 0x6086505C (SB1250 Timer 0)
4 0x007C00000000E0C3 0 0x00000000 0x60883DEC (Spurious Intr
ERROR Handler)
4 0x0000000000020000 0 0x00000000 0x6088391C (Corrected ECC
Error Handler)
4 0x0000000000010000 0 0x00000000 0x60883594 (Bad ECC Error
Handler)
4 0x0000003000000000 0 0x00000000 0x60864BE4 (Sturgeon Error
Handler)
4 0x0003000000000000 0 0x627119BC 0x608839A4 (BCM1250 Host LDT
Bridge Error Handler)
4 0x0000000000040000 0 0x00000000 0x60883C60 (BCM1250 IO-Bus
Error Handler)
4 0x0080000000000000 0 0x00000000 0x60883A2C (BCM1250 Host PCI
Bridge Error Handler)
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