sk0 link bouncing

Hi,

I've got tons of these since I stopped loading the port with traffic....
It seems to have a pretty steady 27 min interval.

Jul  4 07:00:05 freetest kernel: sk0: link state changed to DOWN
Jul  4 07:00:05 freetest kernel: sk0: link state changed to UP
Jul  4 07:27:21 freetest kernel: sk0: link state changed to DOWN
Jul  4 07:27:21 freetest kernel: sk0: link state changed to UP
Jul  4 07:53:48 freetest kernel: sk0: link state changed to DOWN
Jul  4 07:53:48 freetest kernel: sk0: link state changed to UP
Jul  4 08:21:16 freetest kernel: sk0: link state changed to DOWN
Jul  4 08:21:16 freetest kernel: sk0: link state changed to UP
Jul  4 08:48:10 freetest kernel: sk0: link state changed to DOWN
Jul  4 08:48:11 freetest kernel: sk0: link state changed to UP
Jul  4 09:13:38 freetest kernel: sk0: link state changed to DOWN
Jul  4 09:13:38 freetest kernel: sk0: link state changed to UP
Jul  4 09:39:06 freetest kernel: sk0: link state changed to DOWN
Jul  4 09:39:06 freetest kernel: sk0: link state changed to UP

Very recent 10-current install with std GENERIC kernel.
FreeBSD freetest.digiware.nl 10.0-CURRENT FreeBSD 10.0-CURRENT #1: Sat
Jun 30 09:35:43 UTC 2012
root_at_freetest.digiware.nl:/usr/obj/usr/src/sys/GENERIC  amd64

The port is connected to a basic netgear 10/100/1000 switch with nothing
modified in the config of that port.
Other connections do not seem to suffer from disconnecting.

Used the server to 'zfs send' a 360G backup to, and then it did not do
anything like this, the port just stayed up.

Suggestions where of what to look for this?

Thanx,
--WjW

dmesg:
Copyright (c) 1992-2012 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
 The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 10.0-CURRENT #1: Sat Jun 30 09:35:43 UTC 2012
    root_at_freetest.digiware.nl:/usr/obj/usr/src/sys/GENERIC amd64
WARNING: WITNESS option enabled, expect reduced performance.
CPU: Intel(R) Core(TM)2 Duo CPU     E7200  _at_ 2.53GHz (2533.48-MHz
K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x10676  Family = 6  Model = 17
Stepping = 6

Features=0xbfebfbff<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,HTT,TM,PBE>

Features2=0x8e39d<SSE3,DTES64,MON,DS_CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1>
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
  TSC: P-state invariant, performance statistics
real memory  = 6442450944 (6144 MB)
avail memory = 6167552000 (5881 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <A_M_I_ OEMAPIC >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s)
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
ioapic0 <Version 2.0> irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: <A_M_I_ OEMXSDT> on motherboard
acpi0: Power Button (fixed)
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, dff00000 (3) failed
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
attimer0: <AT timer> port 0x40-0x43 irq 0 on acpi0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 950
Event timer "HPET" frequency 14318180 Hz quality 450
Event timer "HPET1" frequency 14318180 Hz quality 440
Event timer "HPET2" frequency 14318180 Hz quality 440
Event timer "HPET3" frequency 14318180 Hz quality 440
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
uhci0: <Intel 82801JI (ICH10) USB controller USB-D> port 0xb800-0xb81f
irq 16 at device 26.0 on pci0
uhci0: LegSup = 0x2f00
usbus0 on uhci0
uhci1: <Intel 82801JI (ICH10) USB controller USB-E> port 0xb880-0xb89f
irq 21 at device 26.1 on pci0
uhci1: LegSup = 0x2f00
usbus1 on uhci1
uhci2: <Intel 82801JI (ICH10) USB controller USB-F> port 0xbc00-0xbc1f
irq 18 at device 26.2 on pci0
uhci2: LegSup = 0x2f00
usbus2 on uhci2
ehci0: <Intel 82801JI (ICH10) USB 2.0 controller USB-B> mem
0xfe8ffc00-0xfe8fffff irq 18 at device 26.7 on pci0
usbus3: EHCI version 1.0
usbus3 on ehci0
hdac0: <Intel 82801JI HDA Controller> mem 0xfe8f8000-0xfe8fbfff irq 22
at device 27.0 on pci0
pcib1: <ACPI PCI-PCI bridge> irq 17 at device 28.0 on pci0
pci3: <ACPI PCI bus> on pcib1
pcib2: <ACPI PCI-PCI bridge> irq 17 at device 28.4 on pci0
pci2: <ACPI PCI bus> on pcib2
atapci0: <Marvell 88SE6121 UDMA133 controller> port
0xdc00-0xdc07,0xd880-0xd883,0xd800-0xd807,0xd480-0xd483,0xd400-0xd40f
mem 0xfeaffc00-0xfeafffff irq 16 at device 0.0 on pci2
ahci0: <Marvell 88SE6121 AHCI SATA controller> at channel -1 on atapci0
ahci0: AHCI v1.00 with 2 3Gbps ports, Port Multiplier supported
ahcich0: <AHCI channel> at channel 0 on ahci0
ahcich1: <AHCI channel> at channel 1 on ahci0
ata2: <ATA channel> at channel 0 on atapci0
pcib3: <ACPI PCI-PCI bridge> irq 16 at device 28.5 on pci0
pci1: <ACPI PCI bus> on pcib3
mskc0: <Marvell Yukon 88E8056 Gigabit Ethernet> port 0xc800-0xc8ff mem
0xfe9fc000-0xfe9fffff irq 17 at device 0.0 on pci1
msk0: <Marvell Technology Group Ltd. Yukon EC Ultra Id 0xb4 Rev 0x03> on
mskc0
msk0: Ethernet address: 00:22:15:46:17:9a
miibus0: <MII bus> on msk0
e1000phy0: <Marvell 88E1149 Gigabit PHY> PHY 0 on miibus0
e1000phy0:  none, 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX,
1000baseT, 1000baseT-master, 1000baseT-FDX, 1000baseT-FDX-master, auto,
auto-flow
uhci3: <Intel 82801JI (ICH10) USB controller USB-A> port 0xb080-0xb09f
irq 23 at device 29.0 on pci0
uhci3: LegSup = 0x2f00
usbus4 on uhci3
uhci4: <Intel 82801JI (ICH10) USB controller USB-B> port 0xb400-0xb41f
irq 19 at device 29.1 on pci0
uhci4: LegSup = 0x2f00
usbus5 on uhci4
uhci5: <Intel 82801JI (ICH10) USB controller USB-C> port 0xb480-0xb49f
irq 18 at device 29.2 on pci0
uhci5: LegSup = 0x2f00
usbus6 on uhci5
ehci1: <Intel 82801JI (ICH10) USB 2.0 controller USB-A> mem
0xfe8ff800-0xfe8ffbff irq 23 at device 29.7 on pci0
usbus7: EHCI version 1.0
usbus7 on ehci1
pcib4: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci4: <ACPI PCI bus> on pcib4
vgapci0: <VGA-compatible display> port 0xe000-0xe0ff mem
0xf0000000-0xf7ffffff,0xfebf0000-0xfebfffff irq 17 at device 1.0 on pci4
skc0: <Marvell Gigabit Ethernet> port 0xe800-0xe8ff mem
0xfebec000-0xfebeffff irq 18 at device 2.0 on pci4
skc0: Marvell Yukon Lite Gigabit Ethernet rev. (0x9)
sk0: <Marvell Semiconductor, Inc. Yukon> on skc0
sk0: Ethernet address: 00:22:15:46:2d:33
miibus1: <MII bus> on sk0
e1000phy1: <Marvell 88E1011 Gigabit PHY> PHY 0 on miibus1
e1000phy1:  none, 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX,
1000baseT, 1000baseT-master, 1000baseT-FDX, 1000baseT-FDX-master, auto
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
ahci1: <Intel ICH10 AHCI SATA controller> port
0xac00-0xac07,0xa880-0xa883,0xa800-0xa807,0xa480-0xa483,0xa400-0xa41f
mem 0xfe8fe800-0xfe8fefff irq 19 at device 31.2 on pci0
ahci1: AHCI v1.20 with 6 3Gbps ports, Port Multiplier supported
ahcich2: <AHCI channel> at channel 0 on ahci1
ahcich3: <AHCI channel> at channel 1 on ahci1
ahcich4: <AHCI channel> at channel 2 on ahci1
ahcich5: <AHCI channel> at channel 3 on ahci1
ahcich6: <AHCI channel> at channel 4 on ahci1
ahcich7: <AHCI channel> at channel 5 on ahci1
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
acpi_button0: <Power Button> on acpi0
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
orm0: <ISA Option ROM> at iomem 0xc0000-0xcbfff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
ppc0: cannot reserve I/O port range
ctl: CAM Target Layer loaded
acpi_perf0: <ACPI CPU Frequency Control> on cpu0
p4tcc0: <CPU Frequency Thermal Control> on cpu0
est1: <Enhanced SpeedStep Frequency Control> on cpu1
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 61a491e0600491e
device_attach: est1 attach returned 6
p4tcc1: <CPU Frequency Thermal Control> on cpu1
ZFS filesystem version: 5
ZFS storage pool version: features support (5000)
Timecounters tick every 1.000 msec
hdacc0: <Analog Devices AD1989B HDA CODEC> at cad 0 on hdac0
hdaa0: <Analog Devices AD1989B HDA CODEC Audio Function Group> at nid 1
on hdacc0
pcm0: <Analog Devices AD1989B HDA CODEC PCM (Analog 7.1/2.0)> at nid
18,36,22,37 and 23,21,24,20 on hdaa0
pcm1: <Analog Devices AD1989B HDA CODEC PCM (Front Analog Headphones)>
at nid 17 on hdaa0
pcm2: <Analog Devices AD1989B HDA CODEC PCM (Rear Digital)> at nid 27 on
hdaa0
pcm3: <Analog Devices AD1989B HDA CODEC PCM (Digital)> at nid 29 on hdaa0
usbus0: 12Mbps Full Speed USB v1.0
usbus1: 12Mbps Full Speed USB v1.0
usbus2: 12Mbps Full Speed USB v1.0
usbus3: 480Mbps High Speed USB v2.0
usbus4: 12Mbps Full Speed USB v1.0
usbus5: 12Mbps Full Speed USB v1.0
usbus6: 12Mbps Full Speed USB v1.0
usbus7: 480Mbps High Speed USB v2.0
ugen0.1: <Intel> at usbus0
uhub0: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
ugen1.1: <Intel> at usbus1
uhub1: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus1
ugen2.1: <Intel> at usbus2
uhub2: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus2
ugen3.1: <Intel> at usbus3
uhub3: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus3
ugen4.1: <Intel> at usbus4
uhub4: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus4
ugen5.1: <Intel> at usbus5
uhub5: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus5
ugen6.1: <Intel> at usbus6
uhub6: <Intel UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus6
ugen7.1: <Intel> at usbus7
uhub7: <Intel EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus7
uhub0: 2 ports with 2 removable, self powered
uhub1: 2 ports with 2 removable, self powered
uhub2: 2 ports with 2 removable, self powered
uhub4: 2 ports with 2 removable, self powered
uhub5: 2 ports with 2 removable, self powered
uhub6: 2 ports with 2 removable, self powered
uhub3: 6 ports with 6 removable, self powered
uhub7: 6 ports with 6 removable, self powered
ada0 at ahcich2 bus 0 scbus3 target 0 lun 0
ada0: <WDC WD5000AAKX-001CA0 15.01H15> ATA-8 SATA 3.x device
ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada0: Command Queueing enabled
ada0: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
ada0: Previously was known as ad10
ada1 at ahcich3 bus 0 scbus4 target 0 lun 0
ada1: <WDC WD5000AAKS-07YGA0 12.01C02> ATA-8 SATA 2.x device
ada1: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada1: Command Queueing enabled
ada1: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
ada1: Previously was known as ad12
ada2 at ahcich4 bus 0 scbus5 target 0 lun 0
ada2: <WDC WD15EADS-00P8B0 01.00A01> ATA-8 SATA 2.x device
ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada2: Command Queueing enabled
ada2: 1430799MB (2930277168 512 byte sectors: 16H 63S/T 16383C)
ada2: Previously was known as ad14
ada3 at ahcich5 bus 0 scbus6 target 0 lun 0
ada3: <WDC WD15EADS-00P8B0 01.00A01> ATA-8 SATA 2.x device
ada3: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada3: Command Queueing enabled
ada3: 1430799MB (2930277168 512 byte sectors: 16H 63S/T 16383C)
ada3: Previously was known as ad16
ada4 at ahcich6 bus 0 scbus7 target 0 lun 0
ada4: <WDC WD15EADS-00P8B0 01.00A01> ATA-8 SATA 2.x device
ada4: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada4: Command Queueing enabled
ada4: 1430799MB (2930277168 512 byte sectors: 16H 63S/T 16383C)
ada4: Previously was known as ad18
ada5 at ahcich7 bus 0 scbus8 target 0 lun 0
ada5: <Corsair CSSD-V32GB2 2.2> ATA-8 SATA 2.x device
ada5: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 512bytes)
ada5: Command Queueing enabled
ada5: 30533MB (62533296 512 byte sectors: 16H 63S/T 16383C)
ada5: Previously was known as ad20
SMP: AP CPU #1 Launched!
WARNING: WITNESS option enabled, expect reduced performance.
Trying to mount root from zfs:zfsroot []...
sk0: link state changed to UP
coretemp0: <CPU On-Die Thermal Sensors> on cpu0
coretemp1: <CPU On-Die Thermal Sensors> on cpu1
est1: <Enhanced SpeedStep Frequency Control> on cpu1
est: CPU supports Enhanced Speedstep, but is not recognized.
est: cpu_vendor GenuineIntel, msr 61a491e0600491e
device_attach: est1 attach returned 6
pid 7641 (try), uid 0: exited on signal 10 (core dumped)
sk0: link state changed to DOWN
sk0: link state changed to UP
sk0: link state changed to DOWN
sk0: link state changed to UP