[dpdk-users] VF RSS availble in I350-T2?
Paul Emmerich
emmericp at net.in.tum.de
Wed Dec 13 12:35:26 CET 2017
Did you consult the datasheet? It says that the VF only supports one queue.
Paul
> Am 12.12.2017 um 13:58 schrieb .. <hyperhead at 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 at 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
>>
--
Chair of Network Architectures and Services
Department of Informatics
Technical University of Munich
Boltzmannstr. 3
85748 Garching bei München, Germany
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