Date: Wed, 11 Feb 2015 20:48:05 +0100 From: Harald Schmalzbauer <h.schmalzbauer@omnilan.de> To: Jack Vogel <jfvogel@gmail.com> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: igb(4) watchdog timeout, lagg(4) fails Message-ID: <54DBB1F5.1090601@omnilan.de> In-Reply-To: <CAFOYbcnNYFhesur3gK71J3Mr1W_KWh6%2BhFjjOZAZ-buAc16k9w@mail.gmail.com> References: <54ACC6A2.1050400@omnilan.de> <54AE565D.50208@omnilan.de> <54AE5A6B.7040601@omnilan.de> <54AFA784.6020102@omnilan.de> <CAFOYbcn0F1QXajUZ2XOncSg8z9xjuCQtzC=Siteyrq%2BDkvAw-A@mail.gmail.com> <54B10432.8050909@omnilan.de> <54DB8975.2030001@omnilan.de> <CAFOYbcnNYFhesur3gK71J3Mr1W_KWh6%2BhFjjOZAZ-buAc16k9w@mail.gmail.com>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigBCE487D69772C77491500C3D Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Bez=FCglich Jack Vogel's Nachricht vom 11.02.2015 18:31 (localtime): > tdh and tdt mean the head and tail indices of the ring, and these > values are > obviously severely borked :) > > I'm buried with some other issues, but I'll try and find some time to l= ook > at this a bit more. Highly appreciated, thanks in advance! For the records: Rebooting the machine (ESXi guest-only!) brought the stalled igb1 back to operation. The guest has 2 igb (kawela) ports, one from a NIC(Intel ET Dual Port 82576)@CPU-PCIe and the second port from an identical NIC, but connected via PCH-PCIe. The watchdog timeout problem only occurs with the port from the PCH-PCIe-connected NIC (falisfied)! After the reboot the suspicious "dev.igb.1.link_irq=3D848" turned into: dev.igb.0.link_irq: 3 dev.igb.1.link_irq: 4 Thanks, -Harry > > On Wed, Feb 11, 2015 at 8:55 AM, Harald Schmalzbauer > <h.schmalzbauer@omnilan.de <mailto:h.schmalzbauer@omnilan.de>> wrote: > > Bez=FCglich Harald Schmalzbauer's Nachricht vom 10.01.2015 11:51 > (localtime): > > Bez=FCglich Jack Vogel's Nachricht vom 09.01.2015 18:46 (localtim= e): > >> The tuneable interrupt rate code is not mine, and looking at it > I'm not > >> entirely > >> sure it works. Why are you focused on the interrupt rate anyway,= > do you have > >> some reason to tie it to the watchdog? > >> > >> You could turn AIM off (enable_aim) and see if that changed > anything? > >> > >> It seems most the time problems show up they involve the use of > lagg, if you > >> take it out of the mix does the problem go away? > =85 > > > Is there a way to reset the interface without rebooting the > machine? The > > watchdog doesn't really reset the device, it's in non-operating s= tate > > afterwards. I need to 'ifconfig down' it for bringin lagg(4) back= > into > > operational state. > > Some kind of D3D0-state switch for a single address? kldunloading= > would > > destroy the remaining interface too=85 > > I could isolate the igb watchdog timeout problem a bit. > It only happens on nics which take the PCH-PCIe route. Nics that ar= e > connected to the CPU's PCIe root complex never show this issue. > > Currently, I suffer from one unresponsible nic which shows the > following > states: > dev.igb.1.%desc: Intel(R) PRO/1000 Network Connection version - 2.4= =2E0 > dev.igb.1.%driver: igb > dev.igb.1.%location: slot=3D0 function=3D0 handle=3D\_SB_.PCI0.PE70= =2ES1F0 > dev.igb.1.%pnpinfo: vendor=3D0x8086 device=3D0x10c9 subvendor=3D0x8= 086 > subdevice=3D0xa03c class=3D0x020000 > dev.igb.1.%parent: pci11 > dev.igb.1.nvm: -1 > dev.igb.1.enable_aim: 1 > dev.igb.1.fc: 3 > dev.igb.1.rx_processing_limit: 250 > dev.igb.1.link_irq: 848 > ^^^^^^^^^^^^^^ 848??? > dev.igb.1.dropped: 0 > dev.igb.1.tx_dma_fail: 0 > dev.igb.1.rx_overruns: 0 > dev.igb.1.watchdog_timeouts: 414 > dev.igb.1.device_control: 1488978497 > dev.igb.1.rx_control: 67272738 > dev.igb.1.interrupt_mask: 4 > dev.igb.1.extended_int_mask: 2147483655 > dev.igb.1.tx_buf_alloc: 0 > dev.igb.1.rx_buf_alloc: 0 > dev.igb.1.fc_high_water: 47488 > dev.igb.1.fc_low_water: 47472 > dev.igb.1.queue0.interrupt_rate: 0 > dev.igb.1.queue0.txd_head: 0 > dev.igb.1.queue0.txd_tail: 0 > dev.igb.1.queue0.no_desc_avail: 2520 > dev.igb.1.queue0.tx_packets: 43894 > dev.igb.1.queue0.rxd_head: 0 > dev.igb.1.queue0.rxd_tail: 0 > dev.igb.1.queue0.rx_packets: 1918054 > dev.igb.1.queue0.rx_bytes: 0 > dev.igb.1.queue0.lro_queued: 0 > dev.igb.1.queue0.lro_flushed: 0 > dev.igb.1.queue1.interrupt_rate: 0 > dev.igb.1.queue1.txd_head: 0 > dev.igb.1.queue1.txd_tail: 0 > dev.igb.1.queue1.no_desc_avail: 17 > dev.igb.1.queue1.tx_packets: 36813 > dev.igb.1.queue1.rxd_head: 0 > dev.igb.1.queue1.rxd_tail: 0 > dev.igb.1.queue1.rx_packets: 63738 > dev.igb.1.queue1.rx_bytes: 0 > dev.igb.1.queue1.lro_queued: 0 > dev.igb.1.queue1.lro_flushed: 0 > =85 > dev.igb.1.interrupts.asserts: 5890499 > dev.igb.1.interrupts.rx_pkt_timer: 2103707 > dev.igb.1.interrupts.rx_abs_timer: 0 > dev.igb.1.interrupts.tx_pkt_timer: 0 > dev.igb.1.interrupts.tx_abs_timer: 1983448 > dev.igb.1.interrupts.tx_queue_empty: 50493 > dev.igb.1.interrupts.tx_queue_min_thresh: 0 > dev.igb.1.interrupts.rx_desc_min_thresh: 0 > dev.igb.1.interrupts.rx_overrun: 0 > > The dev.igb.1.link_irq value doesn't really make sense, does it? > > The rest isn't unusual, just shows the watchdog timeout problem bec= aus > of dev.igb.1.queue0.no_desc_avail I guess. > > I manually adjusted: > hw.igb.num_queues: 2 > hw.igb.rx_process_limit: 250 > hw.igb.rxd: 4096 > hw.igb.txd: 4096 > > Like mentioned, the nics not going through PCH-PCIe don't show this= > problem, falsified. > > This is the regular timeout interval for the last 24h (~3 minutes):= > Feb 11 17:26:53 vega kernel: igb1: Watchdog timeout -- resetting > Feb 11 17:26:53 vega kernel: igb1: Queue(911600000) tdh =3D > 2068077355, hw > tdt =3D 397078446 > Feb 11 17:26:53 vega kernel: igb1: TX(911600000) desc avail =3D > 0,Next TX > to Clean =3D 0 > Feb 11 17:26:53 vega kernel: igb1: link state changed to DOWN > Feb 11 17:26:56 vega kernel: igb1: link state changed to UP > Feb 11 17:26:56 vega devd: Executing '/etc/rc.d/dhclient > quietstart igb1' > Feb 11 17:30:10 vega kernel: igb1: Watchdog timeout -- resetting > Feb 11 17:30:10 vega kernel: igb1: Queue(911600000) tdh =3D > 2068077355, hw > tdt =3D 397078446 > Feb 11 17:30:10 vega kernel: igb1: TX(911600000) desc avail =3D > 0,Next TX > to Clean =3D 0 > Feb 11 17:30:10 vega kernel: igb1: link state changed to DOWN > Feb 11 17:30:13 vega kernel: igb1: link state changed to UP > > But these resets don't bring the interface back into a working > state :-( > "Queue" value remains constant, but "tdh" and "tdt" vary from time = to > time, for example: > igb1: Queue(911600000) tdh =3D -337225283, hw tdt =3D 398180458 > > Unfortunately I don't know what they stand for. Is there an > explanation > for people who don't just look for it in the drivers code? > Any idea where the problem could be? > > Thanks, > > -Harry > > --------------enigBCE487D69772C77491500C3D Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAlTbsfYACgkQLDqVQ9VXb8j82QCghhxH3sIzDK1+YH1x5F5DPXkz dnQAn2BLQOSnyUN+xtg1VCgkz1RgZakI =brzu -----END PGP SIGNATURE----- --------------enigBCE487D69772C77491500C3D--
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