Don,
I'm not sure I understand your answer. If the driver can only filter to 16
queues, what are the extra 24 queues in the default 40-queue count doing?
They definitely receive, and service, interrupts according to
/proc/interrupts.
What is the difference between the (up to) 16 queues I can configure with
RSS and the default 40 that the driver configures?
In my particular situation I seem to find that I have a lot more
rx_no_dma_resources with the default 40, and quite a bit fewer with
RSS=16,16. I was hoping 24 might be a goldilocks style "just right" but I
can only get that many when my hardware has 24 cores (hardware that I don't
have any rx_no_dma_resources problems with).
Thanks,
Scott Silverman
On Tue, Dec 24, 2013 at 11:25 AM, Skidmore, Donald C <
[email protected]> wrote:
> > -----Original Message-----
> > From: Scott Silverman [mailto:[email protected]]
> > Sent: Tuesday, December 24, 2013 6:28 AM
> > To: [email protected]
> > Subject: [E1000-devel] RSS Configuration in ixgbe (Queue limit?)
> >
> > In attempting to troubleshoot the issue with ring buffer drops I wrote
> about
> > in another thread, I've noticed some behavior in ixgbe that does not
> match
> > documentation.
> >
> > Configuring RSS (with RSS=#,#) to a value between 1-16 works as expected.
> > Setting no value (or setting 0, default) configures as many queues as
> there
> > are cores (on a 20 core box with hyperthreading, that is 40 cores per
> > interface). The documentation says that it will only configure the
> lesser of
> > cores or 16.
> >
> > Attempting to manually set a value higher than 16 fails, and acts as if
> a value
> > of 0 was entered. (i.e. RSS=24,24 has no effect, and the full 40 queues
> are
> > created).
> >
> > Should it be stopping at 16? If not, why can't I manually choose queue
> counts
> > of 17-(cores-1) queues?
> >
> >
> > Thanks,
> >
> > Scott Silverman
>
> Hey Scott,
>
> While the driver can only use RSS to filter to 16 queue it can support
> more queues in general. And since ATR is on by default and can support
> your 40 queues so they are all allocated.
>
> Thanks,
> -Don Skidmore <[email protected]>
>
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