[ovs-dev] [PATCH v10 1/5] dpif-netdev: implement function pointers/subtable

Ian Stokes ian.stokes at intel.com
Wed Jul 10 15:54:38 UTC 2019

On 7/10/2019 4:40 PM, Van Haaren, Harry wrote:
>> -----Original Message-----
>> From: Stokes, Ian
>> Sent: Wednesday, July 10, 2019 4:30 PM
>> To: Van Haaren, Harry <harry.van.haaren at intel.com>; dev at openvswitch.org
>> Cc: i.maximets at samsung.com; malvika.gupta at arm.com
>> Subject: Re: [PATCH v10 1/5] dpif-netdev: implement function pointers/subtable
>> On 7/9/2019 1:34 PM, Harry van Haaren wrote:
>>> This allows plugging-in of different subtable hash-lookup-verify
>>> routines, and allows special casing of those functions based on
>>> known context (eg: # of bits set) of the specific subtable.
>>> Signed-off-by: Harry van Haaren <harry.van.haaren at intel.com>
>>> Tested-by: Malvika Gupta <malvika.gupta at arm.com>
>> Thanks for this harry, few minor comments below.
> Hey, cool I'll snip away irrelevant code sections for readability.
> <snip>


>> I've thought about whether an item should be added to the NEWS doc
>> (possibly not in this patch but perhaps later in the series), it's hard
>> to say as the changes are under the hood and not configurable by a user.
>> Thoughts?
> Correct the user shouldn't identify the actual changes, except for small
> gains in performance if the specialized subtables are in use.
> I think it would be good to add a NEWS item, as people profiling OVS's functions
> will see different function names, and having called out the DPCLS Function Pointer
> changes, and why they are there would be beneficial.
> I will draft a separate patch for NEWS item - so we can keep it parallel to this patch set.
> Shout if that is not a good approach :)

I would think it could be added as part of patch 5 of the series as 
that's when the performance increase is introduced? Anyway it's minor 
enough that if there is not another revision of the series it can be 
done upon commit.


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