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From: Thomas Monjalon <thomas@monjalon.net>
To: Dekel Peled <dekelp@mellanox.com>
Cc: stable@dpdk.org, chaozhu@linux.vnet.ibm.com, yskoh@mellanox.com,
shahafs@mellanox.com, dev@dpdk.org, orika@mellanox.com, pradeep@us.ibm.com,
David Christensen <drc@linux.vnet.ibm.com>
Date: Thu, 28 Mar 2019 23:50:28 +0100
Message-ID: <2107406.dfrop5AP8K@xps>
In-Reply-To: <1552913893-43407-1-git-send-email-dekelp@mellanox.com>
References: <1552913893-43407-1-git-send-email-dekelp@mellanox.com>
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Subject: Re: [dpdk-stable] [PATCH] eal/ppc: remove fix of memory barrier for
IBM POWER
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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 [1], 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.
>
> [1] https://www.ibm.com/developerworks/systems/articles/powerpc.html
>
> Fixes: d23a6bd04d72 ("eal/ppc: fix memory barrier for IBM POWER")
> Cc: stable@dpdk.org
>
> Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Applied, thanks