From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <dlrmsghd@gmail.com>
Received: from mail-wi0-f176.google.com (mail-wi0-f176.google.com
 [209.85.212.176]) by dpdk.org (Postfix) with ESMTP id C3135C346
 for <dev@dpdk.org>; Mon, 29 Jun 2015 01:26:54 +0200 (CEST)
Received: by wicgi11 with SMTP id gi11so57600130wic.0
 for <dev@dpdk.org>; Sun, 28 Jun 2015 16:26:54 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:in-reply-to:references:date:message-id:subject:from:to
 :cc:content-type;
 bh=18HLtannU+7JrNnsZsOxs4VD0D4ydV1MotRb5WIWMsY=;
 b=L2BuGMhMaHOOdvq0q4Bma2tmEwT1W6mKwvjyJCeTFvON9XRR9Pmi4EfUecTi43Ad/G
 s7386G248tuWXhb+RjMC75tPwzlgjxYlMxB2h+2wAd/elsL+b/Np/h0p0MnCnzWjBnip
 y4+5aZ1RjXLtB0wnpLFK7nmMWGVFHI/p6bsr51UoyJPaidOBWAxDIuDtjnOuzqSZay2c
 CvmcISvBjQBdL6saZkzj1s6f/qLGj+7rB00DjiVA82ujGHrQxCF5Who4sMOeRW/CbAIL
 pg7j++pYXR6a46+W0kkVfGG21NSebrr5XcXznO2DE/HYcxiKiWCTXxI1Brg+21mQ10lu
 TtIw==
MIME-Version: 1.0
X-Received: by 10.180.91.100 with SMTP id cd4mr16896412wib.1.1435534014630;
 Sun, 28 Jun 2015 16:26:54 -0700 (PDT)
Received: by 10.28.173.196 with HTTP; Sun, 28 Jun 2015 16:26:54 -0700 (PDT)
In-Reply-To: <CADDmorQhkE07rJifQbVSX5R=WsLFsKsdHnHcz-_xqU52asVmWQ@mail.gmail.com>
References: <CADDmorQhkE07rJifQbVSX5R=WsLFsKsdHnHcz-_xqU52asVmWQ@mail.gmail.com>
Date: Mon, 29 Jun 2015 08:26:54 +0900
Message-ID: <CAKBXKmBGDV15NESzSmSOuZr5Nj-k8JpDPJFCOKRwmYTDkrY2zg@mail.gmail.com>
From: Keunhong Lee <dlrmsghd@gmail.com>
To: Abhishek Verma <abhishekv.verma@gmail.com>
Content-Type: text/plain; charset=UTF-8
X-Content-Filtered-By: Mailman/MimeDel 2.1.15
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] Number of memory channels per processor socket?
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: Sun, 28 Jun 2015 23:26:55 -0000

...and -c option gives 'masking' for CPUs.
-c 1 will only activate single core (especially second core) of your system.
If you want to activate both core, you have to give the mask '11'b ('3' in
decimal).


2015-06-28 18:54 GMT+09:00 Abhishek Verma <abhishekv.verma@gmail.com>:

> Hi,
>
> I am new to DPDK and i tried searching the archives in case this had been
> discussed but couldnt find any references and hence this email:
>
> What is the significance of " -n NUM: Number of memory channels per
> processor socket" which is passed as an EAL option? I have a virtual
> machine (VM) spawned using VirtualBox and i am trying to use DPDK to get
> faster access to packets there. I did lscpu, but that didnt give me
> anything interesting that i could use here:
>
> abhishekV@VirtualBox:~/dpdk/dpdk-2.0.0/x86_64-native-linuxapp-gcc/app$
> sudo
> lscpu
> [sudo] password for abhishekV:
>
> Architecture:          x86_64
> CPU op-mode(s):        32-bit, 64-bit
> Byte Order:            Little Endian
> CPU(s):                2
> On-line CPU(s) list:   0,1
> Thread(s) per core:    1
> Core(s) per socket:    2
> Socket(s):             1
> NUMA node(s):          1
> Vendor ID:             GenuineIntel
> CPU family:            6
> Model:                 58
> Stepping:              9
> CPU MHz:               2594.017
> BogoMIPS:              5188.03
> L1d cache:             32K
> L1d cache:             32K
> L2d cache:             6144K
> NUMA node0 CPU(s):     0,1
> abhishekV@VirtualBox:~/dpdk/dpdk-2.0.0/x86_64-native-linuxapp-gcc/app$
>
> I understand that i have two cores and hence should use -c 1 (since i have
> cores 0 and 1). However, i dont understand what to give as the "-n" option.
> Is it always 4?
>
> Thanks, Abhishek
>