Re: [dpdk-dev] [PATCH v3] mempool: replace c memcpy code semantics with optimized rte_memcpy

[Jerin Jacob <jerin.jacob@caviumnetworks.com>]

On Tue, Jul 05, 2016 at 07:32:46PM +0800, Yuanhan Liu wrote:
> On Tue, Jul 05, 2016 at 09:43:03AM +0100, Ferruh Yigit wrote:
> > On 6/30/2016 6:28 PM, Thomas Monjalon wrote:
> > > 2016-06-30 17:46, Jerin Jacob:
> > >> Signed-off-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
> > >> Acked-by: Olivier Matz <olivier.matz@6wind.com>
> > > 
> > > Applied, thanks
> > > 
> > 
> > Hi Jerin,
> > 
> > This commit cause a compilation error on target i686-native-linuxapp-gcc
> > with gcc6.
> 
> Besides that, I'm more curious to know have you actually seen any
> performance boost?

let me first address your curiosity,
http://dpdk.org/dev/patchwork/patch/12993/( check the second comment)
http://dpdk.org/ml/archives/dev/2016-June/042701.html

Ferruh,

I have tested on a x86 machine with gcc 6.1. I could n't see any issues
with i686-native-linuxapp-gcc target

Steps following to create gcc 6.1 toolchain
https://sahas.ra.naman.ms/2016/05/31/building-gcc6-1-on-fedora-23/
(removed --disable-multilib to have support for -m32)

➜ [dpdk-master] $ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/opt/gcc-6.1.0/libexec/gcc/x86_64-pc-linux-gnu/6.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-6.1.0/configure --prefix=/opt/gcc-6.1.0
--enable-languages=c,c++ --enable-libmudflap --with-system-zlib
Thread model: posix
gcc version 6.1.0 (GCC)

More over this issue seems like an issue from x86 rte_memcpy implementation.

Jerin