[dpdk-dev] [PATCH v2] ixgbe: fix occasional timeouts when starting VF

[Iremonger, Bernard]

Hi Thomas,

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com]
> Sent: Tuesday, April 5, 2016 4:48 PM
> To: Iremonger, Bernard <bernard.iremonger at intel.com>
> Cc: dev at dpdk.org; Lu, Wenzhuo <wenzhuo.lu at intel.com>
> Subject: Re: [dpdk-dev] [PATCH v2] ixgbe: fix occasional timeouts when
> starting VF
> 
> 2016-04-05 15:55, Bernard Iremonger:
> > -           poll_ms = 10;
> > +           poll_ms = RTE_IXGBE_REGISTER_POLL_WAIT_15_MS;
> [...]
> >  #define RTE_IXGBE_REGISTER_POLL_WAIT_10_MS  10
> > +#define RTE_IXGBE_REGISTER_POLL_WAIT_15_MS  15
> >  #define RTE_IXGBE_WAIT_100_US               100
> 
> I don't understand why these constants are needed.
> There is no semantic, just an arbitrary number.

I am seeing intermittent failures in the following test at line 4969 in 
ixgbe_rxtx.c:

while (--poll_ms && !(txdctl & IXGBE_TXDCTL_ENABLE))

Increasing the value of poll_ms does not address the root cause of this failure.
This needs more investigation.

Self NAK.