On 10 November 2015 at 13:41, Zoltan Kiss <[email protected]> wrote:
>
>
> On 10/11/15 07:39, Maxim Uvarov wrote:
>
>> JIT like lua might also not work because you need to rewrite OVS to
>> support it. I don't think that it will be accepted.
>>
>> And it looks like it's problem in OVS, not in ODP. I.e. OVS should allow
>> to use library functions for fast path (where inlines are critical).
>> I.e. not just call odp_packet_len(), but move hole OVS function to
>> dynamic library.
>>
>
> I'm not sure I get your point here, but OVS allows to use dynamic library
> functions on fast path. The problem is that it's slow, because of the
> function call overhead.
>
I'm not familiar with ovs code. But for example ovs has something like:
ovs_get_and_packet_process()
{
// here you use some inlines:
pkt = odp_recv();
len = odp_packet_len(pkt);
... etc.
}
So it's clear for each target arch you needs it's own variant of
ovs_get_and_packet_process() function. That function should go from ovs to
dynamic library.
Maxim.
>
>
>> regards,
>> Maxim.
>>
>> On 10 November 2015 at 02:50, Bill Fischofer <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Adding Grant Likely to this chain as it relates to the broader
>> subject of portable ABIs that we've been discussing.
>>
>> On Mon, Nov 9, 2015 at 4:48 PM, Jim Wilson <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> On Mon, Nov 9, 2015 at 2:39 PM, Bill Fischofer
>> <[email protected] <mailto:[email protected]>>
>> wrote:
>> > The IO Visor project appears to be doing something like this
>> with LLVM and
>> > JIT constructs to dynamically insert code into the kernel in a
>> > platform-independent manner. Perhaps we can leverage that
>> technology?
>>
>> GCC has some experimental JIT support, but I think it would be a
>> lot
>> of work to use it, and I don't know how stable it is.
>> https://gcc.gnu.org/wiki/JIT
>> The LLVM support is probably more advanced.
>>
>> Jim
>>
>>
>>
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