On 4 February 2015 at 12:57, Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:
> On Wed, 2015-02-04 at 12:35 +0100, Michal Kazior wrote:
>
>> > (Or maybe wifi drivers should start to use skb->xmit_more as a signal to end aggregation)
>>
>> This could work if your firmware/device supports this kind of thing.
>> To my understanding ath10k firmware doesn't.
>
> This is a pure software signal. You do not need firmware support.
>
> Idea is the following :
>
> Your driver gets a train of messages, coming from upper layers (TCP, IP,
> qdisc)
>
> It can know that a packet is not the last one, by looking at
> skb->xmit_more.
>
> Basically, aggregation logic could use this signal as a very clear
> indicator you got the end of a train -> force the xmit right now.
There's no way to tell ath10k firmware: "xmit right now". The firmware
does all tx aggregation logic by itself. Host driver just submits a
frame and hopes it'll get out soon. It's not even a tx-ring you'd
expect. Each frame has a host assigned id which firmware then uses in
tx completion.
> To disable gso you would have to use :
>
> ethtool -K wlan1 gso off
Oh, thanks! This works. However I can't turn it on:
; ethtool -K wlan1 gso on
Could not change any device features
..so I guess it makes no sense to re-run tests because:
; ethtool -k wlan1 | grep generic
tx-checksum-ip-generic: on [fixed]
generic-segmentation-offload: off [requested on]
generic-receive-offload: on
And this seems to never change.
Michał
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