From: Bruce Richardson <bruce.richardson@intel.com>
To: Konstantin Ananyev <konstantin.ananyev@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v2 2/2] eal/x86: Use lock-prefixed instructions to reduce cost of rte_smp_mb()
Date: Mon, 18 Dec 2017 15:46:06 +0000 [thread overview]
Message-ID: <20171218154606.GA13148@bricha3-MOBL3.ger.corp.intel.com> (raw)
In-Reply-To: <1513611253-8785-3-git-send-email-konstantin.ananyev@intel.com>
On Mon, Dec 18, 2017 at 03:34:13PM +0000, Konstantin Ananyev wrote:
> On x86 it is possible to use lock-prefixed instructions to get
> the similar effect as mfence.
> As pointed by Java guys, on most modern HW that gives a better
> performance than using mfence:
> https://shipilev.net/blog/2014/on-the-fence-with-dependencies/
> That patch adopts that technique for rte_smp_mb() implementation.
> On BDW 2.2 mb_autotest on single lcore reports 2X cycle reduction,
> i.e. from ~110 to ~55 cycles per operation.
>
> Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
> ---
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
next prev parent reply other threads:[~2017-12-18 15:46 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-01 11:12 [dpdk-dev] [PATCH 1/2] test/test: introduce new test-case for rte_smp_mb() Konstantin Ananyev
2017-12-01 11:12 ` [dpdk-dev] [PATCH 2/2] eal/x86: Use lock-prefixed instructions to reduce cost of rte_smp_mb() Konstantin Ananyev
2017-12-01 18:04 ` Stephen Hemminger
2017-12-01 23:08 ` Ananyev, Konstantin
2018-03-08 21:15 ` Stephen Hemminger
2017-12-11 17:11 ` Bruce Richardson
2017-12-11 17:30 ` Ananyev, Konstantin
2017-12-18 15:34 ` [dpdk-dev] [PATCH v2 0/2] eal/x86: Optimize rte_smp_mb() and create a new test case for it Konstantin Ananyev
2017-12-18 15:34 ` [dpdk-dev] [PATCH v2 1/2] test/test: introduce new test-case for rte_smp_mb() Konstantin Ananyev
2018-01-12 17:23 ` Thomas Monjalon
2018-01-12 17:58 ` Ananyev, Konstantin
2018-01-13 13:54 ` Wiles, Keith
2018-01-13 13:54 ` Wiles, Keith
2018-01-15 15:04 ` [dpdk-dev] [PATCH v3 0/2] eal/x86: Optimize rte_smp_mb() and create a new test case for it Konstantin Ananyev
2018-01-15 15:04 ` [dpdk-dev] [PATCH v3 1/2] test/test: introduce new test-case for rte_smp_mb() Konstantin Ananyev
2018-01-16 0:16 ` Thomas Monjalon
2018-01-15 15:04 ` [dpdk-dev] [PATCH v3 2/2] eal/x86: Use lock-prefixed instructions to reduce cost of rte_smp_mb() Konstantin Ananyev
2018-01-15 15:09 ` Konstantin Ananyev
[not found] ` <8b05f533-d146-7f97-48f4-82ddcfc3613b@redhat.com>
2018-01-16 1:54 ` [dpdk-dev] Fwd: " Michael S. Tsirkin
2018-01-29 9:29 ` Ananyev, Konstantin
2018-01-29 17:29 ` Michael S. Tsirkin
2018-01-29 15:47 ` [dpdk-dev] " Thomas Monjalon
2018-01-30 19:33 ` Stephen Hemminger
2017-12-18 15:34 ` [dpdk-dev] [PATCH v2 " Konstantin Ananyev
2017-12-18 15:46 ` Bruce Richardson [this message]
2017-12-11 17:08 ` [dpdk-dev] [PATCH 1/2] test/test: introduce new test-case for rte_smp_mb() Bruce Richardson
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