From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <olivier.matz@6wind.com>
Received: from mail.droids-corp.org (zoll.droids-corp.org [94.23.50.67])
 by dpdk.org (Postfix) with ESMTP id 8A1832C55
 for <dev@dpdk.org>; Thu, 10 Mar 2016 12:12:19 +0100 (CET)
Received: from was59-1-82-226-113-214.fbx.proxad.net ([82.226.113.214]
 helo=[192.168.0.10])
 by mail.droids-corp.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)
 (Exim 4.84) (envelope-from <olivier.matz@6wind.com>)
 id 1adyXP-0006yO-FG; Thu, 10 Mar 2016 12:13:52 +0100
To: Ferruh Yigit <ferruh.yigit@intel.com>,
 Stephen Hemminger <stephen@networkplumber.org>, dev@dpdk.org
References: <1457557926-4056-1-git-send-email-stephen@networkplumber.org>
 <56E1325C.2030206@6wind.com> <56E150FD.2090403@intel.com>
From: Olivier MATZ <olivier.matz@6wind.com>
Message-ID: <56E1568C.5020805@6wind.com>
Date: Thu, 10 Mar 2016 12:12:12 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
 Icedove/38.6.0
MIME-Version: 1.0
In-Reply-To: <56E150FD.2090403@intel.com>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Subject: Re: [dpdk-dev] [PATCH,
 v2] mempool: avoid memory waste with large pagesize
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Thu, 10 Mar 2016 11:12:19 -0000

>> It still does not work. When CONFIG_RTE_LIBRTE_MEMPOOL_DEBUG=y:
>>
>> mp = rte_mempool_create("test", 128,
>> 	64, 0, 0, NULL, NULL, NULL, NULL, SOCKET_ID_ANY, 0);
>> rte_mempool_dump(stdout, mp);
>>
>>   populated_size=128
>>   header_size=64
>>   elt_size=64
>>   trailer_size=64
>>   total_obj_size=192
>>
> With --no-huge (since patch updates that part), it gives:
>   header_size=64
>   elt_size=64
>   trailer_size=0
>   total_obj_size=128
>   private_data_size=3904
> 
> 1- private_data still rounds to page size, not sure if this is a problem.
> 2- with MEMPOOL_DEBUG=y, trailer_size is 0, comment in code says it
> should keep cookie, not sure if this is a problem.

Yes the trailer should at least be 8 bytes to store the cookie.