From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dmitry Vyal <dmitryvyal-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: Re: How to fight forwarding performance regression on
 large mempool sizes.
Date: Fri, 20 Sep 2013 10:48:03 +0400
Message-ID: <523BEFA3.4070209@gmail.com>
References: <523AACC9.8010304@gmail.com>
 <CAFmpvUNzbi7zsAOHeaR5KpX_OBpa_g-TLDr5FYmddqGGAX9pSA@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: dev-VfR2kkLFssw@public.gmane.org
To: Robert Sanford <rsanford-mDvk1qcdE6VWk0Htik3J/w@public.gmane.org>
Return-path: <dev-bounces-VfR2kkLFssw@public.gmane.org>
In-Reply-To: <CAFmpvUNzbi7zsAOHeaR5KpX_OBpa_g-TLDr5FYmddqGGAX9pSA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev-VfR2kkLFssw@public.gmane.org>
List-Help: <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request-VfR2kkLFssw@public.gmane.org?subject=subscribe>
Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org
Sender: "dev" <dev-bounces-VfR2kkLFssw@public.gmane.org>

On 09/19/2013 11:39 PM, Robert Sanford wrote:
> Hi Dmitry,
>
> The biggest drop-off seems to be from size 128K to 256K. Are you using 
> 1GB huge pages already (rather than 2MB)?
>
> I would think that it would not use over 1GB until you ask for 512K 
> mbufs or more.
>

Hi Robert,

Yes, I've been using 1GB pages for a while. My L3 cache is 20MB and 
mbufs are 2240 bytes of size. So something strange indeed happens then 
we move from ~200MB to ~400MB. Any ideas?

Regards,
Dmitry