[dpdk-dev] [dpdk-stable] [PATCH] eal/ppc: remove fix of memory barrier for IBM POWER
thomas at monjalon.net
Thu Mar 28 23:50:28 CET 2019
18/03/2019 13:58, Dekel Peled:
> From previous patch description: "to improve performance on PPC64,
> use light weight sync instruction instead of sync instruction."
> Excerpt from IBM doc , section "Memory barrier instructions":
> "The second form of the sync instruction is light-weight sync,
> or lwsync.
> This form is used to control ordering for storage accesses to system
> memory only. It does not create a memory barrier for accesses to
> device memory."
> This patch removes the use of lwsync, so calls to rte_wmb() and
> rte_rmb() will provide correct memory barrier to ensure order of
> accesses to system memory and device memory.
>  https://www.ibm.com/developerworks/systems/articles/powerpc.html
> Fixes: d23a6bd04d72 ("eal/ppc: fix memory barrier for IBM POWER")
> Cc: stable at dpdk.org
> Signed-off-by: Dekel Peled <dekelp at mellanox.com>
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