My network interface to LAN gigabit switch appears intermittent.

LEDs on switch and on motherboard ethernet port
both cycle through blinking for several seconds, then
off for several seconds

ping just to router drops more than 50% of traffic

ifconfig sometimes shows:
 media: Ethernet autoselect
 status: no carrier
and sometimes shows:
 media: Ethernet autoselect (1000baseT full-duplex)
 status: active

I have a Tyan Tiger K8W motherboard with integrated
Intel Pro/1000MT (82541EI):
 "em0 at pci2 dev 3 function 0 "Intel PRO/1000MT (82541EI)" rev 0x00:
  irq 9, address: 00:e0:81:2d:fb:f3"

Network switch is Netgear GS608.

cables have been swapped - no improvement
another computer has gigabit NIC and connects fine to switch
at gigabit speed using same cable.

OpenBSD 3.7
GENERIC kernel
(first noticed using a RAID with autoconfig kernel, but
problem present with just GENERIC kernel)

dmesg below

Any help or diagnosing assistance appreciated.
Thanks,
Douglas Maus
[EMAIL PROTECTED]


dmesg:

OpenBSD 3.7 (GENERIC) #31: Sun Mar 20 00:42:28 MST 2005
    [EMAIL PROTECTED]:/usr/src/sys/arch/amd64/compile/GENERIC
real mem = 536473600 (523900K)
avail mem = 449060864 (438536K)
using 13148 buffers containing 53854208 bytes (52592K) of memory
mainbus0 (root)
cpu0 at mainbus0: (uniprocessor)
cpu0: AMD Opteron(tm) Processor 242, 1593.33 MHz
cpu0: 
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,MMX,FXSR,SSE,SSE2,NXE,MMXX,LONG,3DNOW2,3DNOW
cpu0: 64KB 64b/line 2-way I-cache, 64KB 64b/line 2-way D-cache, 1MB 64b/line 
16-way L2 cache
cpu0: ITLB 32 4KB entries fully associative, 8 4MB entries fully associative
cpu0: DTLB 32 4KB entries fully associative, 8 4MB entries fully associative
pci0 at mainbus0 bus 0: configuration mode 1
pchb0 at pci0 dev 0 function 0 "AMD 8151 Sys Control" rev 0x14
ppb0 at pci0 dev 1 function 0 "AMD 8151 AGP" rev 0x14
pci1 at ppb0 bus 2
ppb1 at pci0 dev 6 function 0 "AMD 8111 PCI-PCI" rev 0x07
pci2 at ppb1 bus 1
ohci0 at pci2 dev 0 function 0 "AMD 8111 USB" rev 0x0b: irq 11, version 1.0, 
legacy support
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: AMD OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 3 ports with 3 removable, self powered
ohci1 at pci2 dev 0 function 1 "AMD 8111 USB" rev 0x0b: irq 11, version 1.0, 
legacy support
usb1 at ohci1: USB revision 1.0
uhub1 at usb1
uhub1: AMD OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 3 ports with 3 removable, self powered
em0 at pci2 dev 3 function 0 "Intel PRO/1000MT (82541EI)" rev 0x00: irq 9, 
address: 00:e0:81:2d:fb:f3
pciide0 at pci2 dev 5 function 0 "CMD Technology SiI3114 SATA" rev 0x02: DMA
pciide0: using irq 11 for native-PCI interrupt
pciide0: port 2: device present, speed: 1.5Gb/s
wd0 at pciide0 channel 2 drive 0: <ST3250823AS>
wd0: 16-sector PIO, LBA48, 238475MB, 488397168 sectors
wd0(pciide0:2:0): using BIOS timings, Ultra-DMA mode 6
pciide0: port 3: device present, speed: 1.5Gb/s
wd1 at pciide0 channel 3 drive 0: <ST3250823AS>
wd1: 16-sector PIO, LBA48, 238475MB, 488397168 sectors
wd1(pciide0:3:0): using BIOS timings, Ultra-DMA mode 6
"VIA VT6306 FireWire" rev 0x80 at pci2 dev 10 function 0 not configured
uhci0 at pci2 dev 11 function 0 "VIA VT83C572 USB" rev 0x61: irq 10
usb2 at uhci0: USB revision 1.0
uhub2 at usb2
uhub2: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
uhci1 at pci2 dev 11 function 1 "VIA VT83C572 USB" rev 0x61: irq 9
usb3 at uhci1: USB revision 1.0
uhub3 at usb3
uhub3: VIA UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 2 ports with 2 removable, self powered
ehci0 at pci2 dev 11 function 2 "VIA VT6202 USB" rev 0x63: irq 11
ehci0: EHCI version 1.0
ehci0: companion controllers, 2 ports each: uhci0 uhci1
usb4 at ehci0: USB revision 2.0
uhub4 at usb4
uhub4: VIA EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub4: single transaction translator
uhub4: 4 ports with 4 removable, self powered
"AMD AMD8111 LPC" rev 0x05 at pci0 dev 7 function 0 not configured
pciide1 at pci0 dev 7 function 1 "AMD 8111 IDE" rev 0x03: DMA, channel 0 
configured to compatibility, channel 1 configured to compatibility
atapiscsi0 at pciide1 channel 0 drive 0
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <IDE-CD, R/RW 8x4x32, 2.5> SCSI0 5/cdrom removable
cd0(pciide1:0:0): using PIO mode 4, DMA mode 2
pciide1: channel 1 disabled (no drives)
"AMD 8111 SMBus" rev 0x02 at pci0 dev 7 function 2 not configured
"AMD 8111 ACPI" rev 0x05 at pci0 dev 7 function 3 not configured
auich0 at pci0 dev 7 function 5 "AMD 8111 AC97" rev 0x03: irq 10, AMD8111 AC97
ac97: codec id 0x414c4760 (Avance Logic ALC655)
audio0 at auich0
pchb1 at pci0 dev 24 function 0 "AMD AMD64 HyperTransport" rev 0x00
pchb2 at pci0 dev 24 function 1 "AMD AMD64 Address Map" rev 0x00
pchb3 at pci0 dev 24 function 2 "AMD AMD64 DRAM Cfg" rev 0x00
pchb4 at pci0 dev 24 function 3 "AMD AMD64 Misc Cfg" rev 0x00
isa0 at mainbus0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com0: console
com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0 (mux 1 ignored for console): console keyboard
pcppi0 at isa0 port 0x61
sysbeep0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
lm0 at isa0 port 0x290/8: W83627HF
dkcsum: wd0 matched BIOS disk 80
dkcsum: wd1 matched BIOS disk 81
root on wd0a
rootdev=0x0 rrootdev=0x300 rawdev=0x302
raidctl: unable to open device file: /dev/raid0c
Automatic boot in progress: starting file system checks.
/dev/rwd0a: file system is clean; not checking
setting tty flags
starting network
starting system logger
starting rpc daemons:.
savecore: no core dump
checking quotas: done.
building ps databases: kvm dev.
clearing /tmp
starting pre-securelevel daemons:.
setting kernel security level: kern.securelevel: 0 -> 1
creating runtime link editor directory cache.
preserving editor files
starting network daemons: sendmail inetd sshd.
starting local daemons:.
standard daemons: cron.
Wed May 25 11:45:48 EDT 2005

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