Date: Mon, 28 Jun 2010 09:37:18 -0700 From: Mike Carlson <carlson39@llnl.gov> To: freebsd-net@freebsd.org Subject: Intel 10Gb nic (ix driver) and bizarre netstat output Message-ID: <4C28CFBE.6050903@llnl.gov>
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I've got a 10Gb intel nic on a FreeBSD 8.0-p3/AMD64 system, using the ix
driver:
ix0: <Intel(R) PRO/10GbE PCI-Express Network Driver, Version - 1.8.9>
port 0xdce0-0xdcff mem 0xdf3a0000-0xdf3bffff,0xdf3c0000-
0xdf3fffff,0xdf39c000-0xdf39ffff irq 35 at device 0.0 on pci5
ix0: Using MSIX interrupts with 17 vectors
ix0: [ITHREAD]
...
ix0: Ethernet address: 00:1b:21:3f:b5:fc
ix0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9194
options=5bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,LRO>
ether 00:1b:21:3f:b5:fc
inet 192.168.6.56 netmask 0xffffff00 broadcast 192.168.6.255
media: Ethernet autoselect (10Gbase-LR <full-duplex>)
status: active
What seems a bit odd is even when they system is 'idle', netstat reports
a burst of outgoing data at an unpredictable interval:
# netstat -I ix0 -w 1
input (ix0) output
packets errs bytes packets errs bytes colls
1 0 496 1 0 18446744073709551436 0
1 0 252 1 0 0 0
28 0 19768 42 0 0 0
2 0 316 1 0 0 0
1 0 252 1 0 0 0
That large "burst" becomes more frequent if there is a reasonable
network load on the server (like a NFS or Samba file transfer):
# netstat -I ix0 -w 1
input (ix0) output
packets errs bytes packets errs bytes colls
1 0 496 1 0 18446744073709551436 0
1652 0 1601979 2310 0 113716 0
337 0 521230 397 0 18446744073709437900 0
7562 0 276543 14580 0 21130649 0
33784 0 90243561 65289 0 6398014 0
34929 0 101041195 67431 0 18446744073708070746 0
36180 0 102019403 70112 0 932461 0
36337 0 104575965 70340 0 18446744073708694467 0
35933 0 104627291 69241 0 18446744073707935998 0
36498 0 104697232 70544 0 18446744073709094889 0
36580 0 106044621 70737 0 18446744073708270130 0
22934 0 80783509 44337 0 18446744073694340268 0
11469 0 34850586 22131 0 18446744073707453470 0
15661 0 40976798 30191 0 3816924 0
14885 0 40763491 28572 0 1794493 0
14554 0 47191162 28140 0 18446744073703905316 0
16620 0 43843276 32154 0 3277056 0
11800 0 38234856 22832 0 18446744073704976762 0
14640 0 37771926 28340 0 3720383 0
12230 0 37078829 23631 0 18446744073707401669 0
Is this normal? Or, is there something strange about my network
environment, and if so, are there any suggestions to help me narrow down
the issue?
Thanks,
Mike C
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