netdev - Re: BCM5721 transmit queue 0 timed out

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Message-ID: <51E8E9B2.90902@rcs-rds.ro>
Date:	Fri, 19 Jul 2013 10:24:34 +0300
From:	Cosmin GIRADU <cosmin.giradu@...-rds.ro>
To:	Nithin Nayak Sujir <nsujir@...adcom.com>
CC:	Linux Net Dev <netdev@...r.kernel.org>
Subject: Re: BCM5721 transmit queue 0 timed out

On 18/07/13 19:36, Nithin Nayak Sujir wrote:
>
> On 7/18/2013 1:47 AM, Cosmin GIRADU wrote:
>> Hi,
>>
>> I need some help with the following situation:
>>
>> We keep getting random lockups on our BCM5721 cards (most of them are
>> LOMs, multiple machines, running multiple kernel versions between 3.4
>> and 3.10.1), when the traffic is high (above 300Mbit/s). The hardware is
>> dual port "Tigon3 [partno(BCM95721) rev 4201] (PCI Express)" with 5750
>> chip inside.
>
> Cosmin,
> Can you send the full register dump from the kernel log?
This is what I have in the kernel log:

tg3 0000:01:00.0 eth0: Tigon3 [partno(BCM95721) rev 4201] (PCI Express)
MAC address 00:1a:64:6d:e7:57
tg3 0000:01:00.0 eth0: attached PHY is 5750 (10/100/1000Base-T Ethernet)
(WireSpeed[1], EEE[0])
tg3 0000:01:00.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[1] TSOcap[1]
tg3 0000:01:00.0 eth0: dma_rwctrl[76180000] dma_mask[64-bit]
tg3 0000:03:00.0 eth1: Tigon3 [partno(BCM95721) rev 4201] (PCI Express)
MAC address 00:1a:64:6d:e7:58
tg3 0000:03:00.0 eth1: attached PHY is 5750 (10/100/1000Base-T Ethernet)
(WireSpeed[1], EEE[0])
tg3 0000:03:00.0 eth1: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[1] TSOcap[1]
tg3 0000:03:00.0 eth1: dma_rwctrl[76180000] dma_mask[64-bit]
tg3 0000:01:00.0: irq 42 for MSI/MSI-X
tg3 0000:03:00.0: irq 43 for MSI/MSI-X

It's the kernel log from the same machine, after init the NIC names get
translated like this: eth0 -> eth2, eth1 -> eth3, from udev.

If you meant something else, please instruct me on how to obtain it.

>
> Also can you give more details about the system and the traffic? Is it
> reproducible with something like netperf?
We use the system as a qos router with ~6k classes per interface, 40kpps
to 70kpps symmetric,
and the only way I can describe the flows is "completely random".

>
> Nithin.
>
Thank you!

>
>> The lockups look like this:
>>
>> ------------[ cut here ]------------
>> WARNING: at net/sched/sch_generic.c:255 dev_watchdog+0x25a/0x270()
>> NETDEV WATCHDOG: eth2 (tg3): transmit queue 0 timed out
>> Modules linked in: ip_gre ip_tunnel gre loop processor thermal_sys
>> i2c_i801 lpc_ich coretemp button mfd_core
>> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 3.10.1.htb.104 #1
>> Hardware name: IBM IBM System x3250 -[43654BG]-/M31ip, BIOS IBM BIOS
>> Version 1.33-[G9E133AUS-1.33]- 08/28/2007
>>   ffffffff81781f16 ffff88003fd03d98 ffffffff8152f6eb ffff88003fd03dd8
>>   ffffffff8103659b ffff88003fd03dd8 ffff88003d3f0000 ffff88003e103d00
>>   0000000000000005 0000000000000001 ffff88003e0a9428 ffff88003fd03e38
>> Call Trace:
>>   <IRQ>  [<ffffffff8152f6eb>] dump_stack+0x19/0x1e
>>   [<ffffffff8103659b>] warn_slowpath_common+0x6b/0xa0
>>   [<ffffffff81036671>] warn_slowpath_fmt+0x41/0x50
>>   [<ffffffff81471d6a>] dev_watchdog+0x25a/0x270
>>   [<ffffffff81471b10>] ? __netdev_watchdog_up+0x80/0x80
>>   [<ffffffff8104312c>] call_timer_fn+0x2c/0x90
>>   [<ffffffff81043369>] run_timer_softirq+0x1d9/0x1f0
>>   [<ffffffff8103d351>] __do_softirq+0xd1/0x1a0
>>   [<ffffffff8103d4c5>] irq_exit+0x65/0x80
>>   [<ffffffff81024399>] smp_apic_timer_interrupt+0x69/0xa0
>>   [<ffffffff81533b0a>] apic_timer_interrupt+0x6a/0x70
>>   <EOI>  [<ffffffff8100a126>] ? default_idle+0x6/0x10
>>   [<ffffffff8100a2f6>] arch_cpu_idle+0x16/0x20
>>   [<ffffffff8106afd5>] cpu_startup_entry+0xa5/0x200
>>   [<ffffffff818c57ce>] start_secondary+0x267/0x269
>> ---[ end trace d3a202af040f84f0 ]---
>> tg3 0000:01:00.0: tg3_stop_block timed out, ofs=1400 enable_bit=2
>> tg3 0000:01:00.0: tg3_stop_block timed out, ofs=c00 enable_bit=2
>> tg3 0000:01:00.0: tg3_stop_block timed out, ofs=1400 enable_bit=2
>> tg3 0000:01:00.0: tg3_stop_block timed out, ofs=c00 enable_bit=2
>>
>> As far as I can tell the "tg3_stop_block timed out" is thrown when the
>> card is being reset after the hang timer expires and is quite harmless
>> (hope I'm reading it right). However said hangs do tend to be more
>> frequent as the amount of traffic rises, and that does interfere with
>> operation.
>>
>> As a workaround, disabling scatter-gather on the offending cards stops
>> the problem from reappearing, however I'd like to get to the bottom of
>> this once and for all.
>>
>
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-- 

Cosmin GIRADU
OSS Engineer
RCS & RDS - Unified Services
Phone:  +40-31-400-6323
Mobile: +40-77-020-0858
http://www.rcs-rds.ro

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