From: Keunhong Lee <dlrmsghd@gmail.com>
To: Abhishek Verma <abhishekv.verma@gmail.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] Number of memory channels per processor socket?
Date: Mon, 29 Jun 2015 08:26:54 +0900 [thread overview]
Message-ID: <CAKBXKmBGDV15NESzSmSOuZr5Nj-k8JpDPJFCOKRwmYTDkrY2zg@mail.gmail.com> (raw)
In-Reply-To: <CADDmorQhkE07rJifQbVSX5R=WsLFsKsdHnHcz-_xqU52asVmWQ@mail.gmail.com>
...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
>
prev parent reply other threads:[~2015-06-28 23:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-28 9:54 Abhishek Verma
2015-06-28 23:23 ` Keunhong Lee
2015-06-28 23:46 ` Abhishek Verma
2015-06-29 0:13 ` Keunhong Lee
2015-06-28 23:26 ` Keunhong Lee [this message]
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