Re: [dpdk-users] VF RSS availble in I350-T2?

[Paul Emmerich <emmericp@net.in.tum.de>]

Did you consult the datasheet? It says that the VF only supports one queue.

Paul

> Am 12.12.2017 um 13:58 schrieb .. <hyperhead@gmail.com>:
> 
> I assume my message was ignored due to it not being related to dpdk
> software?
> 
> 
> On 11 December 2017 at 10:14, .. <hyperhead@gmail.com> wrote:
> 
>> Hi,
>> 
>> I have an intel I350-T2 which I use for SR-IOV, however, I am hitting some
>> rx_dropped on the card when I start increasing traffic. (I have got more
>> with the same software out of a identical bare metal system)
>> 
>> I am using the Intel igb driver on Centos 7.2 (downloaded from Intel not
>> the driver installed with Centos), so the RSS parameters amongst others are
>> availbe to me
>> 
>> This then led me to investigate the interrupts on the tx rx ring buffers
>> and I noticed that the interface (vfs enabled) only had on tx/rx queue. Its
>> distributed between   This is on the KVM Host
>> 
>>             CPU0       CPU1       CPU2       CPU3       CPU4
>> CPU5       CPU6       CPU7       CPU8
>> 100:          1         33        137          0          0
>> 0          0          0          0     IR-PCI-MSI-edge      ens2f1
>> 101:       2224          0          0       6309     178807
>> 0          0          0          0     IR-PCI-MSI-edge      ens2f1-TxRx-0
>> 
>> Looking at my standard nic ethernet ports I see 1 rx and 4 rx queues
>> 
>> On the VM I only get one tx one rx queue ( I know all the interrupts are
>> only using CPU0) but that is defined in our builds.
>> 
>> egrep "CPU|ens11" /proc/interrupts
>>                   CPU0       CPU1       CPU2       CPU3       CPU4
>> CPU5       CPU6       CPU7
>> 34:  715885552      0          0          0          0
>> 0          0          0          0           PCI-MSI-edge      ens11-tx-0
>> 35:  559402399      0          0          0          0
>> 0          0          0          0           PCI-MSI-edge      ens11-rx-0
>> 
>> I activated RSS in my card, and can set if, however if I use the param
>> max_vfs=n then it  defaults back to to 1 rx 1 tx queue per nic port
>> 
>> [  392.833410] igb 0000:07:00.0: Using MSI-X interrupts. 1 rx queue(s), 1
>> tx queue(s)
>> [  393.035408] igb 0000:07:00.1: Using MSI-X interrupts. 1 rx queue(s), 1
>> tx queue(s)
>> 
>> I have been reading some of the dpdk older posts and see that VF RSS is
>> implemented in some cards, does anybody know if its available in this card
>> (from reading it only seemed the 10GB cards)
>> 
>> One of my plans aside from trying to create more RSS per VM is to add more
>> CPUS to the VM that are not isolated so that the rx and tx queues can
>> distribute their load a bit to see if this helps.
>> 
>> Also is it worth investigating the VMDq options, however I understand this
>> to be less useful than SR-IOV which works well for me with KVM.
>> 
>> 
>> Thanks in advance,
>> 
>> Rolando
>> 

-- 
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Department of Informatics
Technical University of Munich
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