[RFC] kern/kern_timeout.c rewrite in progress

[Hans Petter Selasky]

On 01/17/15 23:18, Hans Petter Selasky wrote:
> On 01/17/15 20:11, Jason Wolfe wrote:
>>
>> HPS,
>>
>> Just to give a quick status update, this patch has most certainly
>> resolved our spin lock held too long panics on stable/10.
>>
>> Thank you to JHB for spending some time digging into the issue and
>> leading us to td_slpcallout as the culprit, and HPS for your rewrite.
>> I had heard rumors of other being affected by similar issues, so this
>> seems like a fine candidate for an MFC if possible.
>>
>> Jason
>>
>
> Hi Jason,
>
> I'm glad to hear that my patch has resolved your issue and I'm happy we
> now have a more stable system.
>
> It was actually a co-worker at work which wrote some bad code which I
> started debugging which then lead me to look at the callout subsystem.
> One bug kills the other ;-)
>
> I'm planning a MFC to 10-stable - yes, and will possibly add the
> _callout_stop_safe() function to not break binary compatibility with
> existing drivers as part of the MFC.
>
> --HPS

Hi,

Here is a followup patch for the TCP stack like I mentioned in the 
beginning of the work done on the callout subsystem:

https://reviews.freebsd.org/D1563

If someone has a setup for massive TCP testing please give it a spin.

Thank you!

--HPS