netdev - Re: [PATCH] net: pktgen: support injecting packets for qdisc testing

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Message-ID: <56926615.6040902@mojatatu.com>
Date:	Sun, 10 Jan 2016 09:09:25 -0500
From:	Jamal Hadi Salim <jhs@...atatu.com>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	netdev@...r.kernel.org, alexei.starovoitov@...il.com,
	davem@...emloft.net
Subject: Re: [PATCH] net: pktgen: support injecting packets for qdisc testing

On 16-01-08 10:24 AM, John Fastabend wrote:
> On 16-01-08 06:38 AM, Jamal Hadi Salim wrote:
>> On 16-01-07 09:28 PM, John Fastabend wrote:
>>>
>>> Hi Jamal,
>>>
>>> per your comment about using pktgen to test qdiscs here is the
>>> patch I've been using most the day which has been working well.
>>> I'm guessing this is more or less what you had in mind.
>>>
>>
>> I have attached the one i used over the holidays - see if there are
>> any differences(sorry dont have much time right now).
>>
>> cheers,
>> jamal
>
> Close except I don't back off the qdisc when I get
> xmit_{drop|cn|policed} return codes because I'm trying to
> stress the qdisc.
>

In that case we need two modes. I think it is important to stress
the qdisc backoff. It doesnt make sense to send packets that will
be dropped. You said you were testing over vlan - how were you
enforcing no backoff?

> Also I don't see the point to doing the skb_get_tx_queue and
> txq_trans_update() this should be called by dev_queue_xmit
> anyways.
>

Yes, those could go away. They are leftovers of another experiment.


> If its all the same to you I would just assume have my version in
> pktgen and later if its useful for you add an option to back-off
> when the qdisc throws an error.


Refer to above. If you can fix it so we can do either i will ACK it.

cheers,
jamal