igb and ALTQ in 9.1-rc3

[Karim Fodil-Lemelin]

Hi Jack,

I think this would help M. Rogers case as we have done something similar 
here to circumvent the issue and it seems to work well. I would also add 
that when using ALTQ we found it much more stable to set the number of 
queues to 1:

static int igb_num_queues = 1;

Our approach consisted in keeping igb_start() defined and using 
igb_mq_start_locked() inside it instead of igb_start_locked().

Regards,

Karim.


On 28/03/2013 7:16 PM, Jack Vogel wrote:
> Have been kept fairly busy with other matters, one thing I could do short
> term is
> change the defines in igb the way I did in the em driver so you could still
> define
> the older if_start entry. Right now those are based on OS version and so
> you will
> automatically get if_transmit, but I could change it to be IGB_LEGACY_TX or
> so,
> and that could be defined in the Makefile.
>
> Would this help?
>
> Jack
>
>
> On Thu, Mar 28, 2013 at 2:31 PM, Nick Rogers <ncrogers at gmail.com> wrote:
>
>> On Tue, Dec 11, 2012 at 1:09 AM, Jack Vogel <jfvogel at gmail.com> wrote:
>>> On Mon, Dec 10, 2012 at 11:58 PM, Gleb Smirnoff <glebius at freebsd.org>
>> wrote:
>>>> On Mon, Dec 10, 2012 at 03:31:19PM -0800, Jack Vogel wrote:
>>>> J> UH, maybe asking the owner of the driver would help :)
>>>> J>
>>>> J> ... and no, I've never been aware of doing anything to stop
>> supporting
>>>> altq
>>>> J> so you wouldn't see any commits. If there's something in the altq
>> code
>>>> or
>>>> J> support (which I have nothing to do with) that caused this no-one
>>>> informed
>>>> J> me.
>>>>
>>>> Switching from if_start to if_transmit effectively disables ALTQ
>> support.
>>>> AFAIR, there is some magic implemented in other drivers that makes them
>>>> modern (that means using if_transmit), but still capable to switch to
>>>> queueing
>>>> mode if SIOCADDALTQ was casted upon them.
>>>>
>>>>
>>> Oh, hmmm, I'll look into the matter after my vacation.
>>>
>>> Jack
>> Has there been any progress on resolving this issue? I recently ran
>> into this problem upgrading my servers from 8.3 to 9.1-RELEASE and am
>> wondering what the latest recommendation is. I've used ALTQ and igb
>> successfully for years and it is unfortunate it no longer works.
>> Appreciate any advice.
>>
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