[Bug 193802] tso seems broken on RELENG10 for version 7.4.2 of em driver

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193802

Friedrich Volkmann <bsd at volki.at> changed:

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                 CC|                            |bsd at volki.at

--- Comment #1 from Friedrich Volkmann <bsd at volki.at> ---
Same here. I run into problems sending TCP data bigger than ~4 KB when the TCO
option is enabled (which is the default!). See
https://forums.freebsd.org/threads/error-sending-tcp-data-4kb.50431 for the
details.

The problems occur with both an up-to-date i386 kernel and an up-to-date amd64
kernel (10.1-STABLE r278696).

dmesg reports:
em0: <Intel(R) PRO/1000 Network Connection 7.4.2> port 0xf080-0xf09f mem
0xf7f00000-0xf7f1ffff,0xf7f3c000-0xf7f3cfff irq 20 at device 25.0 on pci0
em0: Using an MSI interrupt

# ifconfig -v em0
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=4009b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,VLAN_HWTSO>
        ether ...
        inet ... netmask ... broadcast ...
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active

This is an onboard LAN controller (I218-V according to the manual) on an MSI
Z97S SLI Plus motherboard (Intel Z97 Express chipset).

The importance has already been set to "Affects Many People". This is probably
true, and it is difficult for affected users to get help as they cannot send
data. To make it even worse, the symptoms (error messages such as "The server
may be unavailable or is refusing SMTP connections") do not reveal the real
cause of the problem.

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