[Intel-wired-lan] i40e Q

[Jeff Kirsher]

On Wed, 2018-10-03 at 13:08 -0400, Dan Siemon wrote:
> On Wed, 2018-10-03 at 08:04 -0700, Jeff Kirsher wrote:
> > On Tue, 2018-10-02 at 22:24 -0400, Dan Siemon wrote:
> > > Sorry for the direct email but I see on Netdev that you do some
> > > work
> > > on
> > > the i40e driver so I'm hoping you can point me in the right
> > > direction
> > > or to the right forum/person.
> > > 
> > > We have a product based on the X710 and Linux. We occasionally
> see
> > > kernel error messages like the one pasted below. Our product
> > > creates
> > > a
> > > large number of qdiscs, this may be related to tearing down the
> > > qdisc
> > > hierarchy.
> > > 
> > > I'd appreciate any help you can give.
> > 
> > Adding the intel-wired-lan mailing list, as well as the current
> i40e
> > maintainer...
> > 
> > What kernel are you running?
> > Also can you provide the output of lspci -vvv for the network
> > interface?
> > 
> > You say you are running with a large number of qdiscs, can you
> > provide
> > the setup/configuration that you are running?  It would be helpful
> in
> > trying to reproduce the issue in-house and so we can debug the
> issue.
> 
> Thank you for taking the time to forward this on.
> 
> The kernel version is 4.18.X, I don't recall which point release the
> below dump below is from. I've seen similar errors on 4.17 and
> probably
> 4.16 as well though I don't have dumps from those available.
> 
> I have attached the lspci output.
> 
> The qdisc config is essentially a large flat tree of HTB classes each
> with an FQ-CoDel qdisc attached (an eBPF program directs traffic to
> the
> appropriate class). At the moment I can't reproduce that easily
> without
> our software but I can write a script to create the same structure if
> that would be helpful.

I forget to ask for dmesg output as well, if you could provide that, I
would greatly appreciate it.
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