[Intel-wired-lan] [E1000-devel] i40e card Tx resets

[zhuyj <zyjzyj2000@gmail.com>]

On 03/15/2016 02:12 PM, zhuyj wrote:
> Hi,
>
> I have the similar problem. Would you like to make tests with pktgen 
> tools?
> Maybe the test result is not related with tso.

Sorry. I explain this in details.
I have an similar problem. At first, I think it is related with tso.
Then I made tests with pktgen tools and found that this similar problem 
still occurred whether
tso is enabled or not.

So I suggest to make tests with pktgen tools to exclude tso.

Best Regards!
Zhu Yanjun

>
> Zhu Yanjun
>
> On 03/15/2016 05:43 AM, Sowmini Varadhan wrote:
>> Hi,
>>
>> I am trying out some DB stress tests on both i40e and ixgbe. The
>> stress test that I use is rds-stress 
>> (http://linux.die.net/man/1/rds-stress),
>> and I can list out the entire set of steps and parameters that I
>> am using to run this if that info is  interesting.
>>
>> My test bed is a pair of X5-2 (Haswell) servers, each with a
>> Niantic (X540-AT2) card and a Fortville card. The Niantic/fortville
>> cards are connected back-to-back, so I essentially have a 10G
>> connection and a 40G connection.
>>
>> Everything else (kernel, RDS modules, stress test and parameters)
>> remaining the same, I get  the expected throughput on the 10G
>> connection, but the i40e connection goes through a lot of TX
>> errors that result in console messages like this:
>>
>>    i40e 0000:81:00.0: TX driver issue detected, PF reset issued
>>    i40e 0000:81:00.0 eth2: adding 68:05:ca:30:db:30 vid=0
>>    i40e 0000:81:00.0: TX driver issue detected, PF reset issued
>>    i40e 0000:81:00.0 eth2: VSI_seid 390, Hung TX queue 32, 
>> tx_pending: 82, NTC:0xeb, HWB: 0xeb, NTU: 0x13d, TAIL: 0x13d
>>    i40e 0000:81:00.0 eth2: VSI_seid 390, Issuing force_wb for TX 
>> queue 32, Interrupt Reg
>>
>> I understand these are "mdd errors", but how can I find out what
>> triggered these errors, any hints?
>>
>> The other data-point here is that if I disable tso, and fall back
>> to gso, there are no tx errors, and throughput matches the 10G
>> connection (for the same set of test parameters).
>>
>> Please let me know if there is any other info that would help.
>> The kernel is a 4.5.0-rc2 kernel. Info for the i40e card is
>>
>>      # ethtool -i eth3
>>      driver: i40e
>>      version: 1.4.8-k
>>      firmware-version: 5.02 0x80002285 0.0.0
>>      bus-info: 0000:81:00.1
>>         :
>>
>> Thanks in advance,
>> --Sowmini
>>
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>