Making IB a first class citizen.

[Alfred Perlstein]

On 8/23/13 2:29 PM, Vijay Singh wrote:
> We've been running with this change at work for some time and it doesn't seem to be impacting performance at all. We have a statically routed environment though. Also if we really want to optimize for performance wrt routing then IMHO we need to bring back route caching to the tcpcb. Just a thought.
Thanks Vijay, I'll give a little more time and then push this change in.

-Alfred


> Sent from my iPhone
>
> On Aug 23, 2013, at 1:52 PM, Adrian Chadd <adrian at freebsd.org> wrote:
>
>> .. should just check to see what impact it has on performance in the
>> general case. that may change the cache behaviour of the ARP / routing
>> table code.
>>
>>
>>
>> -adrian
>>
>>
>>
>> On 23 August 2013 09:50, Alfred Perlstein <alfred at freebsd.org> wrote:
>>
>>> Hello -net.
>>>
>>> This email is about making Infiniband a first class citizen of the FreeBSD
>>> kernel.
>>>
>>> Right now we have one #ifdef OFED in the src tree that makes compiling
>>> modules a real challenge:
>>>
>>> In sys/net/if_llatbl.h the "struct llentry" size changes based on if OFED
>>> is compiled in or not, only by 16 bytes because Infiniband uses 20bytes for
>>> MAC.  I am wondering if it would be OK to just unifdef this part to make
>>> inifiband a first class citizen of the kernel. Otherwise maybe we can
>>> reverse the ifdef so that it's WITHOUT_OFED and by default have it on.
>>>
>>> I understand that we can not do this for FreeBSD 9.x due to breaking
>>> network ABI, however I think we still have time to do so in FreeBSD 10.x.
>>>
>>> If there's no objection I'd like to push this change into head in the next
>>> day or two.  The only difference is +16 bytes to the "struct llentry".
>>>
>>> Comments?
>>>
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