ixgbevf missed stats

ixgbevf missed stats

[Yaron Illouz]

Hi

There is no statistics of missed packet for ixgbevf in a vm.
How can I get these stats?
In ixgbe it is called imissed

Re: ixgbevf missed stats

[Lu, Wenzhuo]

Hi Yaron,
The stats of PF is done by HW. The bad news is I don' find anything for VF. I also doubt if there's corresponding stats for VF.

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Yaron Illouz
> Sent: Thursday, March 10, 2016 8:27 PM
> To: dev@dpdk.org
> Subject: [dpdk-dev] ixgbevf missed stats
> 
> Hi
> 
> There is no statistics of missed packet for ixgbevf in a vm.
> How can I get these stats?
> In ixgbe it is called imissed

Re: ixgbevf missed stats

[Yaron Illouz]

So I can't know if there where dropps!!!
Is this the same for dpdk with virtio? Can I know if there where dropps?

-----Original Message-----
From: Lu, Wenzhuo [mailto:wenzhuo.lu@intel.com] 
Sent: Thursday, March 10, 2016 2:40 PM
To: Yaron Illouz <yaroni@radcom.com>; dev@dpdk.org
Subject: RE: ixgbevf missed stats

Hi Yaron,
The stats of PF is done by HW. The bad news is I don' find anything for VF. I also doubt if there's corresponding stats for VF.

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Yaron Illouz
> Sent: Thursday, March 10, 2016 8:27 PM
> To: dev@dpdk.org
> Subject: [dpdk-dev] ixgbevf missed stats
> 
> Hi
> 
> There is no statistics of missed packet for ixgbevf in a vm.
> How can I get these stats?
> In ixgbe it is called imissed

Re: ixgbevf missed stats

[Lu, Wenzhuo]

Hi Yaron,

> -----Original Message-----
> From: Yaron Illouz [mailto:yaroni@radcom.com]
> Sent: Thursday, March 10, 2016 8:53 PM
> To: Lu, Wenzhuo; dev@dpdk.org
> Subject: RE: ixgbevf missed stats
> 
> So I can't know if there where dropps!!!
Missed means the RX buffer is not enough. What's in my mind is that there's only one buffer shared, so we cannot split it to every VF. So, for VF, we have to check the PF stats to know there's jam.

> Is this the same for dpdk with virtio? Can I know if there where dropps?
I think this's another story. Let's wait and see what the virtio experts will teach us :)

> 
> -----Original Message-----
> From: Lu, Wenzhuo [mailto:wenzhuo.lu@intel.com]
> Sent: Thursday, March 10, 2016 2:40 PM
> To: Yaron Illouz <yaroni@radcom.com>; dev@dpdk.org
> Subject: RE: ixgbevf missed stats
> 
> Hi Yaron,
> The stats of PF is done by HW. The bad news is I don' find anything for VF. I also
> doubt if there's corresponding stats for VF.
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Yaron Illouz
> > Sent: Thursday, March 10, 2016 8:27 PM
> > To: dev@dpdk.org
> > Subject: [dpdk-dev] ixgbevf missed stats
> >
> > Hi
> >
> > There is no statistics of missed packet for ixgbevf in a vm.
> > How can I get these stats?
> > In ixgbe it is called imissed

Re: ixgbevf missed stats

[Thomas Monjalon]

2016-03-11 00:47, Lu, Wenzhuo:
> From: Yaron Illouz [mailto:yaroni@radcom.com]
> > Is this the same for dpdk with virtio? Can I know if there where dropps?
> I think this's another story. Let's wait and see what the virtio experts will teach us :)

I'm not a virtio expert, but I think it's difficult to communicate an
imissed information when the interface between host and guest is overloaded.

CC Michael Tsirkin who has probably already thought how to solve it.
Would it be possible to have some notifications when packets are dropped
in vhost due to jam?