Making IB a first class citizen.

[Vijay Singh]

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.

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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