Re: wlan0/iwn: no upload statistics

On Thu, Jun 12, 2014 at 01:47:06AM -0400, Marcus Reid wrote:
> On Wed, Jun 11, 2014 at 09:06:45PM +0800, bycn82 wrote:
> > Just tell "the command is not working" cannot help in resolving the
> > problem. Could you please provide more detail? for example.
> 
> I already gave the info that I have.  In this case the data provided by
> the sysctl that gets interface statistics is incomplete.
> 
> systat -ifstat shows:
> 
>      wlan0  in      0.000 KB/s          0.000 KB/s           82.933 MB
>             out     0.000 KB/s          0.000 KB/s            0.000 KB

This was sort of a bad paste, I did it when there was no current activity.  The
'in' side looks fine normally.  Here's another one with activity:

      wlan0  in     11.364 KB/s         71.956 KB/s           95.683 MB
             out     0.000 KB/s          0.000 KB/s            0.000 KB

There's definitely output, just not accounted for on the 'wlan0' interface.
If you look at iwn0, there it is:

netstat -I iwn0 -i 1 shows:

            input           iwn0           output
   packets  errs idrops      bytes    packets  errs      bytes colls
         0     0     0          0         64     0       9456     0
         0     0     0          0         78     0      11354     0
         0     0     0          0         54     0       8160     0
         0     0     0          0         46     0       7656     0
         0     0     0          0         56     0       8158     0

Marcus

> In the systat case, it appears to poll each interface with a:
> 
>   20966 systat   SCTL  "net.link.generic.ifdata.3.1"
> 
> netstat -I wlan0 -i 1 shows:
> 
>             input          wlan0           output
>    packets  errs idrops      bytes    packets  errs      bytes colls
>          7     0     0       5010          7     0          0     0
>         15     0     0      10378         15     0          0     0
>         22     0     0      14164         18     0          0     0
>         21     0     0      13058         19     0          0     0
>    ...
> 
> Note that there are output packets, but not output bytes listed.
> netstat appears to use netgraph for its data, so both the sysctl and
> netgraph methods of getting the data is affected similarly.
> 
> This is where the trail went cold for me.  I tried looking at the iwn
> driver sources but did not find the place where any counters in the
> kernel are updated.  Maybe someone more familiar with the way network
> drivers are written would have better luck.
> 
> I had written it off as a hardware quirk when I looked into it, but it
> looks like more than just my wireless card is affected.
> 
> Marcus
> 
> 
> > 1. Firewall can tell you the total in/out traffic
> > 2. The systat -ifstat result.
> > 3. Netstat information
> > 
> > In previous email, the guy provided the below information.
> > 
> > > > systat -ifstat output:
> > > > Interface           Traffic               Peak                Total
> > > >      wlan0  in      1.066 KB/s         16.155 KB/s          377.757 MB
> > > >             out     0.000 KB/s          0.000 KB/s            0.000 KB
> > 
> > Can you please confirm whether the "377.757 MB" is `in` or `out` traffic?
> > 
> > 
> > > -----Original Message-----
> > > From: owner-freebsd-current_at_freebsd.org [mailto:owner-freebsd-
> > > current_at_freebsd.org] On Behalf Of Marcus Reid
> > > Sent: 11 June, 2014 18:05
> > > To: Stefan Ehmann
> > > Cc: freebsd-current_at_freebsd.org
> > > Subject: Re: wlan0/iwn: no upload statistics
> > > 
> > > On Sat, Jun 07, 2014 at 11:26:39AM +0200, Stefan Ehmann wrote:
> > > > Network monitoring tools show download traffic, but no upload data.
> > > 
> > > I have an iwn0: <Intel WiFi Link 5100> and have the same problem.  I was
> > > able to track it down to being some missing ifmib(4) data, secifically
> > > ifi_obytes from the if_data structure (see ifnet(9)).
> > > 
> > > This was a little while back, and I seem to remember someone else with
> > > using iwn that didn't have the problem.  Another thing is that if you do
> > > a 'netstat -I wlan0 -i 1', output bytes are missing, but if you look at
> > > iwn0 instead all you see is the output bytes and nothing else (except
> > > sometimes you get some numbers in the output packets column seemingly at
> > > random).
> > > 
> > > Marcus
> > > 
> > > >
> > > > systat -ifstat output:
> > > > Interface           Traffic               Peak                Total
> > > >      wlan0  in      1.066 KB/s         16.155 KB/s          377.757 MB
> > > >             out     0.000 KB/s          0.000 KB/s            0.000 KB
> > > >
> > > >
> > > > Tested on amd64 CURRENT from few days ago.
> > > >
> > > > netword Card is:
> > > > iwn0: <Intel Centrino Ultimate-N 6300> mem 0xf2000000-0xf2001fff irq
> > > > 17 at device 0.0 on pci3
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