Re: [PATCH v2] xen-netfront: Fix Rx stall during network stress and OOM

[Vineeth Remanan Pillai]

On 01/15/2017 10:24 PM, Juergen Gross wrote:
> On 13/01/17 18:55, Remanan Pillai wrote:
> > From: Vineeth Remanan Pillai <vineethp@xxxxxxxxxx>
> >
> > During an OOM scenario, request slots could not be created as skb
> > allocation fails. So the netback cannot pass in packets and netfront
> > wrongly assumes that there is no more work to be done and it disables
> > polling. This causes Rx to stall.
> >
> > The issue is with the retry logic which schedules the timer if the
> > created slots are less than NET_RX_SLOTS_MIN. The count of new request
> > slots to be pushed are calculated as a difference between new req_prod
> > and rsp_cons which could be more than the actual slots, if there are
> > unconsumed responses.
> >
> > The fix is to calculate the count of newly created slots as the
> > difference between new req_prod and old req_prod.
> >
> > Signed-off-by: Vineeth Remanan Pillai <vineethp@xxxxxxxxxx>
> Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Thanks Juergen.

David,

Could you please pick up this change for net-next if there no more 
concerns..

Many Thanks,
Vineeth

> Thanks,
>
> Juergen