kern/152828: [em] poor performance on 8.1, 8.2-PRE

[Arnaud Lacombe]

Hi,

On Wed, Jul 20, 2011 at 12:07 PM, Steven Hartland
<killing at multiplay.co.uk> wrote:
> We're seeing tcp stalls under igb under 8.2-RELEASE and 8-STABLE (which
> shares
> some code with em) and the workaround for use is currently adding the
> following
> to /boot/loader.conf
> hw.igb.enable_msix=0
>
> Might be worth trying that.
>
Unless error of my part, you were pointed out in [0] that you had TCP
retransmission issue and you never follow-up that mail.

 - Arnaud

[0]: http://www.mail-archive.com/freebsd-net@freebsd.org/msg37292.html

>   Regards
>   Steve
>
> ----- Original Message ----- From: "Michael W. Lucas"
> <mwlucas at blackhelicopters.org>
> To: <freebsd-net at FreeBSD.org>
> Sent: Wednesday, July 20, 2011 4:50 PM
> Subject: Re: kern/152828: [em] poor performance on 8.1, 8.2-PRE
>
>
>> The following reply was made to PR kern/152828; it has been noted by
>> GNATS.
>>
>> From: "Michael W. Lucas" <mwlucas at blackhelicopters.org>
>> To: bug-followup at FreeBSD.org
>> Cc: rick at sloservers.com
>> Subject: Re: kern/152828: [em] poor performance on 8.1, 8.2-PRE
>> Date: Wed, 20 Jul 2011 11:49:08 -0400
>>
>> I'm seeing the exact same problem here as the original poster. Is
>> anybody looking at this?
>>
>> Running FreeBSD 8.2-RELEASE-p1 amd64, from FreeNAS 8.0
>>
>> sysctls:
>> dev.em.0.%desc: Intel(R) PRO/1000 Network Connection 7.1.9
>> dev.em.0.%driver: em
>> dev.em.0.%location: slot=0 function=0
>> dev.em.0.%pnpinfo: vendor=0x8086 device=0x108b subvendor=0x8086
>> subdevice=0x0000 class=0x020000
>> dev.em.0.%parent: pci1
>> dev.em.0.nvm: -1
>> dev.em.0.debug: -1
>> ...
>>
>> ifconfig:
>> em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>>
>>  options=219b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,WOL_MAGIC>
>>        ether 00:15:17:31:c8:fe
>>        inet 139.171.199.13 netmask 0xffffff00 broadcast 139.171.199.255
>>        media: Ethernet autoselect (1000baseT <full-duplex>)
>>        status: active
>>
>> dmesg | grep em0
>> em0: <Intel(R) PRO/1000 Network Connection 7.1.9> port 0xbc00-0xbc1f mem
>> 0xff6e0000-0xff6fffff irq 16 at device 0.0 on pci1
>> em0: Using an MSI interrupt
>> em0: [FILTER]
>> em0: Ethernet address: 00:15:17:31:c8:fe
>>
>>
>>
>>
>> --
>> Michael W. Lucas http://www.MichaelWLucas.com/,
>> http://blather.MichaelWLucas.com/
>> Latest book: Network Flow Analysis http://www.networkflowanalysis.com/
>> mwlucas at BlackHelicopters.org, Twitter @mwlauthor
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>>
>
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