re0 link UP/DOWN on 8.1-STABLE amd64

[Zeus V Panchenko]

Hi All,

can enybody help with the subj, please?

problem: onboard interface re0 link state UP/DOWN flapping


i have:
# uname -a 
FreeBSD 8.1-STABLE #0: Mon Aug  9 10:33:17 EEST 2010 amd64

# dmidecode
...
Base Board Information
     Manufacturer: ASUSTeK Computer INC.
     Product Name: AT5NM10-I
...

# pciconf -lcv
re0 at pci0:2:0:0: class=0x020000 card=0x83a31043 chip=0x816810ec rev=0x03 hdr=0x00
    vendor     = 'Realtek Semiconductor'
    device     = 'Gigabit Ethernet NIC(NDIS 6.0) (RTL8168/8111/8111c)'
    class      = network
    subclass   = ethernet
    cap 01[40] = powerspec 3  supports D0 D1 D2 D3  current D0
    cap 05[50] = MSI supports 1 message, 64 bit enabled with 1 message
    cap 10[70] = PCI-Express 2 endpoint IRQ 2 max data 128(256) link x1(x1)
    cap 11[ac] = MSI-X supports 4 messages in map 0x20
    cap 03[cc] = VPD


# ifconfig re0
re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=389b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_UCAST,WOL_MCAST,WOL_MAGIC>
        ether 20:cf:30:89:5e:95
        inet 10.10.0.111 netmask 0xffff0000 broadcast 10.10.255.255
        media: Ethernet 1000baseT <full-duplex>
        status: active




sporadically interface begins to flap and dmesg shows:
...
Aug 11 14:29:44 kernel: re0: link state changed to DOWN
Aug 11 14:29:47 kernel: re0: link state changed to UP
Aug 11 14:29:58 kernel: re0: link state changed to DOWN
Aug 11 14:30:01 kernel: re0: link state changed to UP
...


systat doesn't show high interrupts on the card
# systat -v
    1 users    Load  0.06  0.02  0.00                  Aug 11 15:45

Mem:KB    REAL            VIRTUAL                       VN PAGER   SWAP PAGER
        Tot   Share      Tot    Share    Free           in   out     in   out
Act 1069020  177580  2968312   209660  455852  count
All 1149408  184236 1076855k   251780          pages
Proc:                                                            Interrupts
  r   p   d   s   w   Csw  Trp  Sys  Int  Sof  Flt    278 cow    8057 total
  1          74       885  842 1181   57  268  736    278 zfod        atkbd0 1
                                                          ozfod    22 rl0 irq17
 0.4%Sys   0.1%Intr  0.2%User  0.0%Nice 99.3%Idle        %ozfod  2000 cpu0: time
|    |    |    |    |    |    |    |    |    |    |       daefr    33 re0 irq256
                                                      379 prcfr     2 ahci0 257
                                        29 dtbuf      704 totfr  2000 cpu1: time
Namei     Name-cache   Dir-cache    100000 desvn          react  2000 cpu3: time
   Calls    hits   %    hits   %     87484 numvn          pdwak  2000 cpu2: time
     921     921 100                 24183 frevn          pdpgs
                                                        3 intrn
Disks  ada0  ada1 pass0 pass1                      576392 wire
KB/t  21.40  0.00  0.00  0.00                     1040084 act
tps       2     0     0     0                     1948900 inact
MB/s   0.04  0.00  0.00  0.00                             cache
%busy     0     0     0     0                      455852 free
                                                   427520 buf


i have changed motherboards ... the same effect. after some time the
problem appears again


is there any info i can provide?

thanks in advance
-- 
Zeus V. Panchenko
IT Dpt., IBS ltd			      	        GMT+2 (EET)