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

[Steven Hartland]

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.

    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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