netdev - Re: [PATCH net-next] udp: handle gro

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Message-ID: <581a1e57.7029.1606e6f4d4f.Coremail.zhanglkk1990@163.com>
Date:   Tue, 19 Dec 2017 19:01:16 +0800 (CST)
From:   zhangliping <zhanglkk1990@....com>
To:     "Paolo Abeni" <pabeni@...hat.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        zhangliping <zhangliping02@...du.com>
Subject: Re: [PATCH net-next] udp: handle gro_receive only when necessary

Hi,

At 2017-12-18 22:45:30, "Paolo Abeni" <pabeni@...hat.com> wrote:
>Understood, thanks. Still the time spent in 'udp4_lib_lookup2' looks
>quite different/higher than what I observe in my tests. Are you using
>x86_64? if not, do you see many cache misses in udp4_lib_lookup2?

Yes, x86_64. Here is the host's lscpu output info:
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                12
On-line CPU(s) list:   0-11
Thread(s) per core:    1
Core(s) per socket:    6
CPU socket(s):         2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 62
Stepping:              4
CPU MHz:               2095.074
BogoMIPS:              4196.28
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              15360K
NUMA node0 CPU(s):     0-5
NUMA node1 CPU(s):     6-11

Btw, my guest OS is Centos 3.10.0-514.26.2.el7.x86_64, is this kernel
too old to be tested?