[ath9k-devel] [PATCH 2/2] ath9k: Add more recv stats.

[Ben Greear <greearb@candelatech.com>]

On 04/04/2012 05:01 AM, Felix Fietkau wrote:

>> + * @rx_beacons:  No. of beacons received.
>> + * @rx_frags:  No. of rx-fragements received.
> Why should the driver keep track of those last two?

Well, for instance, I often see around 5Mbps of total rx bytes
(as counted by the NIC), but much less transmitted.  And this is
with stations sending to stations.

I was trying to figure out where the extra packets come from.  It
seems beacons is a lot of it so it seemed worth counting.  And maybe
fragments count towards that too since there would be more overhead???

As for rx-frags, just seemed useful to know how many frags
were received.  My understanding is that this is like receiving
1/2 of a packet at a time...so if we wanted to know how many
real packets the NIC received, we'd need to take frags v/s non-frags
into account.  The current logic that counts 'all-packets' for
the rx path is counting individual fragments, I think.

At least for beacons, as long as they are always passed up
the stack, I can count them in the mac80211 layer instead if
you prefer.

Thanks,
Ben

>
> - Felix


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com