Date: Wed, 20 Jul 2011 18:02:12 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Jack Vogel" <jfvogel@gmail.com> Cc: freebsd-net@freebsd.org, "Michael W. Lucas" <mwlucas@blackhelicopters.org> Subject: Re: kern/152828: [em] poor performance on 8.1, 8.2-PRE Message-ID: <2976D84B193E4D7DAE6F4C4E28B8F909@multiplay.co.uk> References: <201107201550.p6KFo9rH032569@freefall.freebsd.org><54AEE240C5F8411A9D4274605DBD14BC@multiplay.co.uk> <CAFOYbckYazC0D4qjK__vv5eGOE_y01qYWgY4T5zz%2BET=ru1ORg@mail.gmail.com>
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Apologies, thought it might be worth a shot, but clearly not thanks for clarifying :)
You absolutely correct with the msix masking the issue, we've just this minute had it stall again even with MSIX disabled :(
I agree we have many machines using igb and em without issue even under lots of load.
Not wishing to hijack this thread, but any advise on what else to try to diagnose this stalling issue would be gratefully received.
Regards
Steve
----- Original Message -----=20
From: Jack Vogel=20
To: Steven Hartland=20
Cc: Michael W. Lucas ; freebsd-net@freebsd.org=20
Sent: Wednesday, July 20, 2011 5:38 PM
Subject: Re: kern/152828: [em] poor performance on 8.1, 8.2-PRE
This is an em bug, igb does not share interrupt code with em, furthermore the adapter
the filer of the bug is using doesn't use MSIX, only one type in the em driver does,
and I might add lots of heavy users on that adapter have MSIX on without issues.
I believe turning MSIX off is just masking whatever your real issue is, if you wish to
run that way that's fine, but please don't advertise that as a 'fix' in some general way.
Regards,
Jack
On Wed, Jul 20, 2011 at 9:07 AM, Steven Hartland <killing@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=3D0
Might be worth trying that.
Regards
Steve
----- Original Message ----- From: "Michael W. Lucas" <mwlucas@blackhelicopters.org>
To: <freebsd-net@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@blackhelicopters.org>
To: bug-followup@FreeBSD.org
Cc: rick@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=3D0 function=3D0
dev.em.0.%pnpinfo: vendor=3D0x8086 device=3D0x108b subvendor=3D0x8086 subdevice=3D0x0000 class=3D0x020000
dev.em.0.%parent: pci1
dev.em.0.nvm: -1
dev.em.0.debug: -1
...
ifconfig:
em0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=3D219b<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
--=20
Michael W. Lucas http://www.MichaelWLucas.com/, http://blather.MichaelWLucas.com/
Latest book: Network Flow Analysis http://www.networkflowanalysis.com/
mwlucas@BlackHelicopters.org, Twitter @mwlauthor
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