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

[Juergen Gross]

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