Re: [dpdk-dev] [PATCH] prefetch second cacheline of mbufs on alloc

[Olivier MATZ <olivier.matz@6wind.com>]

Hi Thomas,


On 07/20/2015 03:00 AM, Thomas Monjalon wrote:
> Please Olivier,
> What is the status of this patch?

>From what I remember, the last mail was a comment from Konstantin
on another thread (but same topic):
http://dpdk.org/ml/archives/dev/2015-May/017633.html


Regards,
Olivier


> 
> 2015-05-12 01:15, Paul Emmerich:
>> this improves the throughput of a simple tx-only application by 11% in
>> the full-featured ixgbe tx path and by 14% in the simple tx path.
>> ---
>>  lib/librte_mbuf/rte_mbuf.h | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h
>> index ab6de67..f6895b4 100644
>> --- a/lib/librte_mbuf/rte_mbuf.h
>> +++ b/lib/librte_mbuf/rte_mbuf.h
>> @@ -538,6 +538,7 @@ static inline struct rte_mbuf *__rte_mbuf_raw_alloc(struct rte_mempool *mp)
>>  	if (rte_mempool_get(mp, &mb) < 0)
>>  		return NULL;
>>  	m = (struct rte_mbuf *)mb;
>> +	rte_prefetch0(&m->cacheline1);
>>  	RTE_MBUF_ASSERT(rte_mbuf_refcnt_read(m) == 0);
>>  	rte_mbuf_refcnt_set(m, 1);
>>  	return (m);
>>
> 
>