freebsd stable - Jan 2010 - Problematic network performance with Marvell 8072 on HP Probook 4710s

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On Sun, Jan 24, 2010 at 07:39:11PM +0100, Emanuele A. Bagnaschi
wrote:
> Hi,
> I've been experiencing a troubling issue with a Marvell 8072 NIC on an
HP
> ProBook 4710s. 
> I first noticed that there is a problem while transferring some files
> through scp to a FreeBSD8-STABLE server: CPUs usage sky-rocketed to 100%
(system)
> and network performance was awful (about 1.8 MiB/s).
> I tried and succeeded in reproducing the issue with 'ttcp'. I
decided
> to use this little benchmark because is so simple (it is linked only
against libc) that I can
> be sure that the problem doesn't depend on scp/ssh or other parts of
the system.
> 
Last time I checked ttcp, it was broken with threading. So you have
to build ttcp without threading support or use netperf to check
performance numbers.
> This is the output of 'uname -a':
> 
> FreeBSD polaris 8.0-STABLE FreeBSD 8.0-STABLE #24: Sun Jan 17 21:08:02
> CET 2010     toor@polaris:/usr/obj/usr/src/sys/POLARIS  amd64
> 
> Here it's some relevant information to identify the NIC:
> 
> first from 'dmesg'
> 
> mskc0: <Marvell Yukon 88E8072 Gigabit Ethernet> port 0x2000-0x20ff
mem
> 0x90100000-0x90103fff irq 17 at device 0.0 on pci134
> msk0: <Marvell Technology Group Ltd. Yukon EX Id 0xb5 Rev 0x02> on
mskc0
> msk0: Ethernet address: 00:25:b3:52:fc:fa
> miibus0: <MII bus> on msk0
> mskc0: [FILTER]
> msk0: link state changed to DOWN
> msk0: link state changed to UP
> 
> and then from 'pciconf -lv'
> 
> mskc0@pci0:134:0:0:     class=0x020000 card=0x3074103c chip=0x436c11ab
> rev=0x10 hdr=0x00
>     vendor     = 'Marvell Semiconductor (Was: Galileo Technology
Ltd)'
>     device     = 'Marvell 8072 Ethernet Nic (88E8072)'
>     class      = network
>     subclass   = ethernet
> 
> Here it's the output of 'ifconfig':
> 
> msk0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
> 1500
>        
options=19b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4>
>         ether 00:25:b3:52:fc:fa
>         inet 192.168.1.4 netmask 0xffffff00 broadcast 192.168.1.255
>         media: Ethernet autoselect (100baseTX
<full-duplex,flag0,flag1>)
>         satus: active
> 
> 
> Attached you will find the results of my tests, I hope that the file
> will be self-explanatory.
> 
It seems you have Yukon Extreme controller and its revision is B0
which is known to have various silicon bug. How about disabling TX 
related offloading?(e.g. ifconfig msk0 -txcsum -tso) Does that make
any difference?
> I'm wondering, are there any other tunable parameters (apart from MSI
on/off) I
> should try to modify? Should I file a PR? Are there any other interesting
data
> I should gather? With the proper guide I'm also available to contribute
some
> code myself.
> 
Given that high rates of silicon bug of Yukon having a detailed
errata information would be great help to analyze the issue. But we
still have no access to the information as well as datasheet.