[dpdk-dev] [PATCH] mk: using initial-exec model for thread local variable

[Yang, Zhiyong]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Marvin Liu
> Sent: Saturday, April 28, 2018 5:54 PM
> To: dev at dpdk.org
> Cc: Liu, Yong <yong.liu at intel.com>
> Subject: [dpdk-dev] [PATCH] mk: using initial-exec model for thread local
> variable
> 
> When building share library, thread-local storage model will be changed to
> global-dynamic. It will cost additional protect for read thread local variable. By
> now only lcore id is this kind of varaible and not need to dynamic share with
> other threads. So make TLS model back to initial-exec like static library for
> better performance.
> 
> Signed-off-by: Marvin Liu <yong.liu at intel.com>
> 

For vhost-user, 
If no this pach, vhost user in shared lib perf drops 14.3% than working in static.
after applying the patch , vhost-user in shared lib can achieve the similar perf as  in static lib.

Tested-by:  Zhiyong Yang <zhiyong.yang at intel.com>