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problems with PCIX-bus NICs



hello,

I am using a Dell 1850. The onboard Intel NICs works fine.
Additional PCIX cards are not working correct.

ifconfig wm0
wm0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        
capabilities=2bf80<TSO4,IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx,TCP4CSUM_Tx,UDP4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Tx,UDP6CSUM_Tx>
        enabled=0
        address: 00:04:23:c3:96:78
        media: Ethernet autoselect (1000baseT full-duplex)
        status: active
        inet6 2001:638:c:a00a::3 prefixlen 64
        inet6 fe80::204:23ff:fec3:9678%wm0 prefixlen 64 scopeid 0x1

dmesg | grep wm0
wm0 at pci2 dev 12 function 0: Intel i82546GB 1000BASE-T Ethernet, rev. 3
wm0: interrupting at ioapic0 pin 16
wm0: 64-bit 100MHz PCIX bus
wm0: 256 word (8 address bits) MicroWire EEPROM
wm0: Ethernet address 00:04:23:c3:96:78
makphy0 at wm0 phy 1: Marvell 88E1011 Gigabit PHY, rev. 5


bash-4.0# ping6 2001:638:c:a00a::2
PING6(56=40+8+8 bytes) 2001:638:c:a00a::3 --> 2001:638:c:a00a::2
16 bytes from 2001:638:c:a00a::2, icmp_seq=0 hlim=64 time=15239.578 ms
16 bytes from 2001:638:c:a00a::2, icmp_seq=1 hlim=64 time=14164.122 ms
16 bytes from 2001:638:c:a00a::2, icmp_seq=2 hlim=64 time=13160.750 ms
16 bytes from 2001:638:c:a00a::2, icmp_seq=3 hlim=64 time=12168.065 ms
16 bytes from 2001:638:c:a00a::2, icmp_seq=4 hlim=64 time=11164.693 ms
16 bytes from 2001:638:c:a00a::2, icmp_seq=5 hlim=64 time=10161.225 ms
16 bytes from 2001:638:c:a00a::2, icmp_seq=6 hlim=64 time=9168.556 ms
16 bytes from 2001:638:c:a00a::2, icmp_seq=7 hlim=64 time=8165.168 ms
16 bytes from 2001:638:c:a00a::2, icmp_seq=8 hlim=64 time=7161.975 ms


I have changed the Intel NIC and also tested a Broadcom based NIC on different PCIX Slots. Always the same behavior.

The same test with a onboard NIC reports a ping time less than 1 ms.


Any Ideas what could be the problem?


Thank you for your efforts
Uwe


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