NFS lockup when copying a "special" file

Oliver Lehmann lehmann at
Thu Jul 13 19:06:27 UTC 2006

Sean McNeil wrote:

> I used to have a similar problem and tracked it down to my NIC and
> hardware checksums.  Would this happen to be an if_re device?  Can you
> give ifconfig info and if hardware checksums are on, try your test with
> them turned off (RXCSUM and TXCSUM).  You can try different combos of
> these if turning off both helps.

Yeah, it is indeed an on-board if_re:

re0: <RealTek 8169S Single-chip Gigabit Ethernet> port 0xe800-0xe8ff mem 0xcfffff00-0xcfffffff irq 16 at device 11.0 on pci0
miibus0: <MII bus> on re0
rgephy0: <RTL8169S/8110S media interface> on miibus0
rgephy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseTX, 1000baseTX-FDX, auto
re0: Ethernet address: 00:11:09:cf:e2:e1
re0: [FAST]

olivleh1 at kartoffel olivleh1> ifconfig
        inet6 fe80::211:9ff:fecf:e2e1%re0 prefixlen 64 scopeid 0x1 
        inet netmask 0xffffff00 broadcast
        ether 00:11:09:cf:e2:e1
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet6 ::1 prefixlen 128 
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3 
        inet netmask 0xff000000 

olivleh1 at kartoffel olivleh1> uname -a
FreeBSD 6.1-STABLE FreeBSD 6.1-STABLE #0: Fri Jul  7 18:40:18 CEST 2006     olivleh1 at  amd64

How can I disable checksum offloading?

 Oliver Lehmann

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