From: "Wiles, Roger Keith" <keith.wiles@windriver.com>
To: "ANANYEV, KONSTANTIN" <konstantin.ananyev@intel.com>
Cc: "<dev@dpdk.org>" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH] Function __mempool_get_bulk() returns wrong count.
Date: Sun, 28 Sep 2014 22:57:05 +0000 [thread overview]
Message-ID: <2085FE90-8322-4249-B22D-776E8F213A36@windriver.com> (raw)
In-Reply-To: <2601191342CEEE43887BDE71AB977258213851AC@IRSMSX104.ger.corp.intel.com>
On Sep 28, 2014, at 5:25 PM, Ananyev, Konstantin <konstantin.ananyev@intel.com> wrote:
>
>
>> -----Original Message-----
>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Wiles, Roger Keith
>> Sent: Saturday, September 27, 2014 7:42 PM
>> To: <dev@dpdk.org>
>> Subject: [dpdk-dev] [PATCH] Function __mempool_get_bulk() returns wrong count.
>>
>>
>> When __mempool_get_bulk() grabs entries from the cache it
>> returns zero instead of the number of entries obtained. Plus
>> the stats were increased by the wrong count of objects.
>>
>> Signed-off-by: Keith Wiles <keith.wiles@windriver.com>
>> ---
>> lib/librte_mempool/rte_mempool.h | 6 +++---
>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/lib/librte_mempool/rte_mempool.h b/lib/librte_mempool/rte_mempool.h
>> index 299d4d7..6750e78 100644
>> --- a/lib/librte_mempool/rte_mempool.h
>> +++ b/lib/librte_mempool/rte_mempool.h
>> @@ -988,9 +988,9 @@ __mempool_get_bulk(struct rte_mempool *mp, void **obj_table,
>>
>> cache->len -= n;
>>
>> - __MEMPOOL_STAT_ADD(mp, get_success, n_orig);
>> + __MEMPOOL_STAT_ADD(mp, get_success, n);
>
> As I can see n == n_orig.
> We can completely remove n_orig, but from other side - I don't see any harm here.
In the RFC patch I sent I remove n_orig.
>
>>
>> - return 0;
>> + return n;
>
> As I can see, __mempool_get_bulk supposed to return 0,
> if all n objects were allocated from mbuf, or a negative error code otherwise.
> Check all usages of __mempool_get_bulk(), plus the fact that it does below:
> ret = rte_ring_mc_dequeue_bulk(mp->ring, obj_table, n);
> and rte_ring_mc_dequeue_bulk() is just wrapper for __rte_ring_mc_do_dequeue(..., n, RTE_RING_QUEUE_FIXED);
> I.e. - either allocate all n objects, or return with failure.
> So, yes we should return 0 here.
> The only thing that probably needs to be done here: fix the comments.
> Instead of:
> - >=0: Success; number of objects supplied.
> Something like:
> - 0: Success; n objects supplied.
>
>>
>> ring_dequeue:
>> #endif /* RTE_MEMPOOL_CACHE_MAX_SIZE > 0 */
>> @@ -1004,7 +1004,7 @@ ring_dequeue:
>> if (ret < 0)
>> __MEMPOOL_STAT_ADD(mp, get_fail, n_orig);
>> else
>> - __MEMPOOL_STAT_ADD(mp, get_success, n_orig);
>> + __MEMPOOL_STAT_ADD(mp, get_success, ret);
>
> That seems incorrect tom me.
> ret would be either 0 on success, or negative error value.
Notice ‘if (ret < 0)’ above so ret can not be negative in this case only zero or positive.
>
> Konstantin
>
>
>>
>> return ret;
>> }
>> --
>> 2.1.0Keith Wiles, Principal Technologist with CTO office, Wind River mobile 972-213-5533
>
>
> As I can see
Keith Wiles, Principal Technologist with CTO office, Wind River mobile 972-213-5533
next prev parent reply other threads:[~2014-09-28 22:50 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-27 18:41 Wiles, Roger Keith
2014-09-28 0:38 ` Neil Horman
2014-09-28 22:25 ` Ananyev, Konstantin
2014-09-28 22:57 ` Wiles, Roger Keith [this message]
2014-09-28 23:00 ` Ananyev, Konstantin
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