From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
To: "Gavin Hu (Arm Technology China)" <Gavin.Hu@arm.com>,
Stephen Hemminger <stephen@networkplumber.org>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"thomas@monjalon.net" <thomas@monjalon.net>,
"olivier.matz@6wind.com" <olivier.matz@6wind.com>,
"chaozhu@linux.vnet.ibm.com" <chaozhu@linux.vnet.ibm.com>,
"bruce.richardson@intel.com" <bruce.richardson@intel.com>,
"konstantin.ananyev@intel.com" <konstantin.ananyev@intel.com>,
"jerin.jacob@caviumnetworks.com" <jerin.jacob@caviumnetworks.com>,
"stable@dpdk.org" <stable@dpdk.org>, nd <nd@arm.com>
Subject: Re: [dpdk-stable] [PATCH v4 2/2] ring: move the atomic load of head above the loop
Date: Fri, 2 Nov 2018 04:30:36 +0000 [thread overview]
Message-ID: <AM6PR08MB3672EB57F02379CD5649C6C998CF0@AM6PR08MB3672.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <VI1PR08MB3167308B62BB96B9F99A93B08FCF0@VI1PR08MB3167.eurprd08.prod.outlook.com>
<Fixing this to make the reply inline, making email plain text>
On Thu, 1 Nov 2018 17:53:51 +0800
Gavin Hu <mailto:gavin.hu@arm.com> wrote:
> +* **Updated the ring library with C11 memory model.**
> +
> + Updated the ring library with C11 memory model including the following changes:
> +
> + * Synchronize the load and store of the tail
> + * Move the atomic load of head above the loop
> +
Does this really need to be in the release notes? Is it a user visible change
or just an internal/optimization and fix.
[Gavin] There is no api changes, but this is a significant change as ring is fundamental and widely used, it decreases latency by 25% in our tests, it may do even better for cases with more contending producers/consumers or deeper depth of rings.
[Honnappa] I agree with Stephen. Release notes should be written from DPDK user perspective. In the rte_ring case, the user has the option of choosing between c11 and non-c11 algorithms. Performance would be one of the criteria to choose between these 2 algorithms. IMO, it probably makes sense to indicate that the performance of c11 based algorithm has been improved. However, I do not know what DPDK has followed historically regarding performance optimizations. I would prefer to follow whatever has been followed so far.
I do not think that we need to document the details of the internal changes since it does not help the user make a decision.
next prev parent reply other threads:[~2018-11-02 4:30 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1541157688-40012-1-git-send-email-gavin.hu@arm.com>
[not found] ` <1541066031-29125-1-git-send-email-gavin.hu@arm.com>
[not found] ` <1540981587-88590-1-git-send-email-gavin.hu@arm.com>
[not found] ` <1540956945-211373-1-git-send-email-gavin.hu@arm.com>
2018-10-31 10:26 ` [dpdk-stable] [PATCH v3 1/2] ring: synchronize the load and store of the tail Gavin Hu
2018-10-31 22:07 ` [dpdk-stable] [dpdk-dev] " Stephen Hemminger
2018-11-01 9:56 ` Gavin Hu (Arm Technology China)
2018-10-31 10:26 ` [dpdk-stable] [PATCH v3 2/2] ring: move the atomic load of head above the loop Gavin Hu
2018-11-01 9:53 ` [dpdk-stable] [PATCH v4 1/2] ring: synchronize the load and store of the tail Gavin Hu
2018-11-01 9:53 ` [dpdk-stable] [PATCH v4 2/2] ring: move the atomic load of head above the loop Gavin Hu
2018-11-01 17:26 ` Stephen Hemminger
2018-11-02 0:53 ` Gavin Hu (Arm Technology China)
2018-11-02 4:30 ` Honnappa Nagarahalli [this message]
2018-11-02 7:15 ` Gavin Hu (Arm Technology China)
2018-11-02 9:36 ` Thomas Monjalon
2018-11-02 11:23 ` Gavin Hu (Arm Technology China)
2018-11-02 11:21 ` [dpdk-stable] [PATCH v5 1/2] ring: synchronize the load and store of the tail Gavin Hu
2018-11-05 9:30 ` Olivier Matz
2018-11-02 11:21 ` [dpdk-stable] [PATCH v5 2/2] ring: move the atomic load of head above the loop Gavin Hu
2018-11-02 11:43 ` Bruce Richardson
2018-11-03 1:19 ` Gavin Hu (Arm Technology China)
2018-11-03 9:34 ` Honnappa Nagarahalli
2018-11-05 13:17 ` Thomas Monjalon
2018-11-05 13:41 ` Jerin Jacob
2018-11-05 9:44 ` Olivier Matz
2018-11-05 13:36 ` Thomas Monjalon
2018-08-06 1:18 [dpdk-stable] [PATCH] ring: fix c11 memory ordering issue Gavin Hu
2018-08-06 9:19 ` [dpdk-stable] [dpdk-dev] " Thomas Monjalon
2018-08-08 1:39 ` Gavin Hu
2018-08-07 3:19 ` [dpdk-stable] [PATCH v2] " Gavin Hu
2018-08-07 5:56 ` He, Jia
2018-08-07 7:56 ` Gavin Hu
2018-08-08 3:07 ` Jerin Jacob
2018-08-08 7:23 ` Thomas Monjalon
[not found] ` <20180917074735.28161-1-gavin.hu@arm.com>
2018-09-17 7:47 ` [dpdk-stable] [PATCH v3 3/3] doc: add cross compile part for sample applications Gavin Hu
2018-09-17 9:48 ` Jerin Jacob
2018-09-17 10:28 ` Gavin Hu (Arm Technology China)
2018-09-17 10:34 ` Jerin Jacob
2018-09-17 10:55 ` Gavin Hu (Arm Technology China)
2018-09-17 10:49 ` [dpdk-stable] [PATCH v4] " Gavin Hu
2018-09-17 10:53 ` [dpdk-stable] [PATCH v5] " Gavin Hu
2018-09-18 11:00 ` Jerin Jacob
2018-09-19 0:33 ` [dpdk-stable] [PATCH v6] " Gavin Hu
2018-09-17 8:11 ` [dpdk-stable] [PATCH v4 1/4] bus/fslmc: fix undefined reference of memsegs Gavin Hu
2018-09-17 8:11 ` [dpdk-stable] [PATCH v4 2/4] ring: read tail using atomic load Gavin Hu
2018-09-20 6:41 ` Jerin Jacob
2018-09-25 9:26 ` Gavin Hu (Arm Technology China)
2018-09-17 8:11 ` [dpdk-stable] [PATCH v4 3/4] ring: synchronize the load and store of the tail Gavin Hu
2018-09-17 8:11 ` [dpdk-stable] [PATCH v4 4/4] ring: move the atomic load of head above the loop Gavin Hu
2018-10-27 14:21 ` Thomas Monjalon
2018-09-17 8:17 ` [dpdk-stable] [PATCH v3 1/3] ring: read tail using atomic load Gavin Hu
2018-09-17 8:17 ` [dpdk-stable] [PATCH v3 2/3] ring: synchronize the load and store of the tail Gavin Hu
2018-09-26 9:29 ` Gavin Hu (Arm Technology China)
2018-09-26 9:59 ` Justin He
2018-09-29 10:57 ` Jerin Jacob
2018-10-17 6:29 ` [dpdk-stable] [PATCH 1/2] " Gavin Hu
2018-10-17 6:29 ` [dpdk-stable] [PATCH 2/2] ring: move the atomic load of head above the loop Gavin Hu
2018-10-17 6:35 ` [dpdk-stable] [PATCH 1/2] ring: synchronize the load and store of the tail Gavin Hu (Arm Technology China)
2018-10-27 14:39 ` [dpdk-stable] [dpdk-dev] " Thomas Monjalon
2018-10-27 15:00 ` Jerin Jacob
2018-10-27 15:13 ` Thomas Monjalon
2018-10-27 15:34 ` Jerin Jacob
2018-10-27 15:48 ` Thomas Monjalon
2018-10-29 2:51 ` Gavin Hu (Arm Technology China)
2018-10-29 2:57 ` Gavin Hu (Arm Technology China)
2018-10-29 10:16 ` Jerin Jacob
2018-10-29 10:47 ` Thomas Monjalon
2018-10-29 11:10 ` Jerin Jacob
2018-11-03 20:12 ` Mattias Rönnblom
2018-11-05 21:51 ` Honnappa Nagarahalli
2018-11-06 11:03 ` Mattias Rönnblom
[not found] ` <1540955698-209159-1-git-send-email-gavin.hu@arm.com>
2018-10-31 3:14 ` [dpdk-stable] [PATCH v2 " Gavin Hu
2018-10-31 3:14 ` [dpdk-stable] [PATCH v2 2/2] ring: move the atomic load of head above the loop Gavin Hu
2018-10-31 3:35 ` [dpdk-stable] [PATCH v2 1/2] ring: synchronize the load and store of the tail Gavin Hu
2018-10-31 3:35 ` [dpdk-stable] [PATCH v2 2/2] ring: move the atomic load of head above the loop Gavin Hu
2018-10-31 9:36 ` Thomas Monjalon
2018-10-31 10:27 ` Gavin Hu (Arm Technology China)
2018-09-17 8:17 ` [dpdk-stable] [PATCH v3 3/3] " Gavin Hu
2018-09-26 9:29 ` Gavin Hu (Arm Technology China)
2018-09-26 10:06 ` Justin He
2018-09-29 7:19 ` [dpdk-stable] [dpdk-dev] " Stephen Hemminger
2018-09-29 10:59 ` [dpdk-stable] " Jerin Jacob
2018-09-26 9:29 ` [dpdk-stable] [PATCH v3 1/3] ring: read tail using atomic load Gavin Hu (Arm Technology China)
2018-09-26 10:09 ` Justin He
2018-09-29 10:48 ` Jerin Jacob
2018-10-05 0:47 ` Gavin Hu (Arm Technology China)
2018-10-05 8:21 ` Ananyev, Konstantin
2018-10-05 11:15 ` Ola Liljedahl
2018-10-05 11:36 ` Ola Liljedahl
2018-10-05 13:44 ` Ananyev, Konstantin
2018-10-05 14:21 ` Ola Liljedahl
2018-10-05 15:11 ` Honnappa Nagarahalli
2018-10-05 17:07 ` Jerin Jacob
2018-10-05 18:05 ` Ola Liljedahl
2018-10-05 20:06 ` Honnappa Nagarahalli
2018-10-05 20:17 ` Ola Liljedahl
2018-10-05 20:29 ` Honnappa Nagarahalli
2018-10-05 20:34 ` Ola Liljedahl
2018-10-06 7:41 ` Jerin Jacob
2018-10-06 19:44 ` Ola Liljedahl
2018-10-06 19:59 ` Ola Liljedahl
2018-10-07 4:02 ` Jerin Jacob
2018-10-07 20:11 ` Ola Liljedahl
2018-10-07 20:44 ` Ola Liljedahl
2018-10-08 6:06 ` Jerin Jacob
2018-10-08 9:22 ` Ola Liljedahl
2018-10-08 10:00 ` Jerin Jacob
2018-10-08 10:25 ` Ola Liljedahl
2018-10-08 10:33 ` Gavin Hu (Arm Technology China)
2018-10-08 10:39 ` Ola Liljedahl
2018-10-08 10:41 ` Gavin Hu (Arm Technology China)
2018-10-08 10:49 ` Jerin Jacob
2018-10-10 6:28 ` Gavin Hu (Arm Technology China)
2018-10-10 19:26 ` Honnappa Nagarahalli
2018-10-08 10:46 ` Jerin Jacob
2018-10-08 11:21 ` Ola Liljedahl
2018-10-08 11:50 ` Jerin Jacob
2018-10-08 11:59 ` Ola Liljedahl
2018-10-08 12:05 ` Jerin Jacob
2018-10-08 12:20 ` [dpdk-stable] [dpdk-dev] " Jerin Jacob
2018-10-08 12:30 ` Ola Liljedahl
2018-10-09 8:53 ` Olivier Matz
2018-10-09 3:16 ` [dpdk-stable] " Honnappa Nagarahalli
2018-10-08 14:43 ` [dpdk-stable] [dpdk-dev] " Bruce Richardson
2018-10-08 14:46 ` Ola Liljedahl
2018-10-08 15:45 ` Ola Liljedahl
2018-10-08 5:27 ` [dpdk-stable] " Honnappa Nagarahalli
2018-10-08 10:01 ` Ola Liljedahl
2018-10-27 14:17 ` Thomas Monjalon
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