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

[Thomas Monjalon <thomas@monjalon.net>]

12/12/2017 13:58, ..:
> I assume my message was ignored due to it not being related to dpdk
> software?

It is ignored because people have not read it or are not expert in
this hardware.
I am CC'ing the maintainer of igb/e1000.


> 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
> >
>