Re: [dpdk-users] Drops seems with virtio PMD driver

[Venumadhav Josyula <vjosyula@gmail.com>]

Hi Stephen,
 >Are you using KVM?
Yes
>Did you enable virtio net acceleration?
Will get back to you. Can you let me what are benefits of it ?

Thanks,
Regards
Venu

On Thu, 29 Aug 2019 at 20:10, Stephen Hemminger <stephen@networkplumber.org>
wrote:

> On Thu, 29 Aug 2019 10:12:27 +0530
> Venumadhav Josyula <vjosyula@gmail.com> wrote:
>
> > Hi All,
> >
> > We are observing packet drops ~@90Mbs with virtio pmd driver. These
> packets
> > are not been
> > queued in the tx descriptors, the function 'rte_eth_tx_burst' is
> returning
> > the less than n.
> >
> > So questions are following
> > i)  are there any issues seen ?
> >
> > Observations in our case :-
> > i) packets are dropped and tx packets donot get incremented.
> > ii) i) happens for 30 secs after that it recovers.
> > iii) After sometime we see this issue in i) & ii) again.
> >
> > Any clues / pointers will help.
> >
> > Thanks,
> > Regards,
> > Venu
>
> The number of transmit descriptors is fixed.
> If you are producing packets faster than the other consume them then the
> transmit descriptor ring gets full. So the problem is probably on the other
> side of your virtio. Are you using KVM? Did you enable virtio net
> acceleration?
>