svn commit: r254520 - in head/sys: kern sys

[Navdeep Parhar]

On 08/19/13 14:08, Andre Oppermann wrote:
> On 19.08.2013 19:40, Peter Grehan wrote:
>>> I recently tried some experiments to reduce the number of mbuf and
>>> cluster allocations in a 40G NIC driver.  M_NOFREE and EXT_EXTREF proved
>>> very useful and the code changes to the kernel were minimal.  See
>>> user/np/cxl_tuning.  The experiment was quite successful and I was
>>> planning to bring in most of those changes to HEAD.  I was hoping to get
>>> some runtime mileage on the approach in general before tweaking the
>>> ctors/dtors for jumpbo, jumbo9, jumbo16 to allow for an mbuf+refcnt
>>> within the cluster.  But now M_NOFREE has vanished without a warning...
>>
>>   I also had a virtualization work-in-progress where static mbufs were
>> allocated in the kernel and
>> M_NOFREE set.
>>
>>   Might be worth sending a prior heads-up for these type of changes.
> 
> I'm sorry for ambushing but this stuff has to be done.  I have provided
> an alternative way of handling it and I'm happy to help you with your
> use case to make it good for you and to prevent the mbuf system from
> getting bloated and hackish again.

I don't know what Peter's use case is but I'm curious about the
already-available alternative to M_NOFREE, if that's what you meant.
Can you please elaborate?

Regards,
Navdeep