* [dpdk-dev] About "Multi-process" sample application
@ 2013-09-12 7:16 dvr
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From: dvr @ 2013-09-12 7:16 UTC (permalink / raw)
To: dev
hi,all
I tried to run multi-process sample application step by step according to the document of "sample_application_user_guide.pdf", but encount a problem: only the first rx_queue can receive packages, the other three rx_queue have no package at all. How could this happen? Did I need to do some other configuration?
Any help will be appreciate.
Best regards.
Maria
From dmitryvyal@gmail.com Thu Sep 12 09:52:00 2013
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Message-ID: <523172C3.2040309@gmail.com>
Date: Thu, 12 Sep 2013 11:52:35 +0400
From: Dmitry Vyal <dmitryvyal@gmail.com>
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Subject: [dpdk-dev] Looks like rte_mempool_free_count() and
rte_mempool_count() are swapped
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Greetings.
I had a suspect I run into a mbuf depletion issue and decided to check
using rte_mempool_free_count(). To my surprise, it returned a value
equal to mempool size. I tried calling rte_mempool_count() and it
returned zero.
I inspected the code in dpdk-1.3.1-7 and dpdk.1.4.1-4:
rte_mempool_count(const struct rte_mempool *mp)
{
unsigned count;
count = rte_ring_count(mp->ring);
#if RTE_MEMPOOL_CACHE_MAX_SIZE > 0
{
unsigned lcore_id;
if (mp->cache_size == 0)
return count;
for (lcore_id = 0; lcore_id < RTE_MAX_LCORE; lcore_id++)
count += mp->local_cache[lcore_id].len;
}
#endif
/*
* due to race condition (access to len is not locked), the
* total can be greater than size... so fix the result
*/
if (count > mp->size)
return mp->size;
return count;
}
If I understand it correctly, the ring contains free buffers and
rte_ring_count() returns a number of entries inside a ring. So this
function actually calculates the number of free entries, not busy.
Moreover, rte_mempool_count() is used in many places. For example it's
called in rte_mempool_free_count() and rte_mempool_full().
Can anyone confirm or refute my findings?
Regards,
Dmitry
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