Date: Wed, 20 Jul 2011 09:38:53 -0700 From: Jack Vogel <jfvogel@gmail.com> To: Steven Hartland <killing@multiplay.co.uk> 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: <CAFOYbckYazC0D4qjK__vv5eGOE_y01qYWgY4T5zz%2BET=ru1ORg@mail.gmail.com> In-Reply-To: <54AEE240C5F8411A9D4274605DBD14BC@multiplay.co.uk> References: <201107201550.p6KFo9rH032569@freefall.freebsd.org> <54AEE240C5F8411A9D4274605DBD14BC@multiplay.co.uk>
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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=0 > > 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=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/ <http://blather.MichaelWLucas.com/>; >> Latest book: Network Flow Analysis http://www.**networkflowanalysis.com/<http://www.networkflowanalysis.com/>; >> mwlucas@BlackHelicopters.org, Twitter @mwlauthor >> ______________________________**_________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/**mailman/listinfo/freebsd-net<http://lists.freebsd.org/mailman/listinfo/freebsd-net>; >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@**freebsd.org<freebsd-net-unsubscribe@freebsd.org> >> " >> >> > ==============================**================== > This e.mail is private and confidential between Multiplay (UK) Ltd. and the > person or entity to whom it is addressed. In the event of misdirection, the > recipient is prohibited from using, copying, printing or otherwise > disseminating it or any information contained in it. > In the event of misdirection, illegible or incomplete transmission please > telephone +44 845 868 1337 > or return the E.mail to postmaster@multiplay.co.uk. > > > ______________________________**_________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/**mailman/listinfo/freebsd-net<http://lists.freebsd.org/mailman/listinfo/freebsd-net>; > To unsubscribe, send any mail to "freebsd-net-unsubscribe@**freebsd.org<freebsd-net-unsubscribe@freebsd.org> > " >
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