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From: Thomas Monjalon <thomas@monjalon.net>
To: ferruh.yigit@intel.com, bruce.richardson@intel.com,
	konstantin.ananyev@intel.com
Cc: stable@dpdk.org, keith.wiles@intel.com,
	Yongseok Koh <yskoh@mellanox.com>,
	dev@dpdk.org, Shahaf Shuler <shahafs@mellanox.com>,
	anatoly.burakov@intel.com, justin.parus@microsoft.com,
	christian.ehrhardt@canonical.com, david.coronel@canonical.com,
	josh.powers@canonical.com, jay.vosburgh@canonical.com,
	dan.streetman@canonical.com
Subject: Re: [dpdk-dev] [dpdk-stable] AVX512 bug on SkyLake
Date: Sat, 10 Nov 2018 03:13:29 +0100	[thread overview]
Message-ID: <15598804.PupyfcORSR@xps> (raw)
In-Reply-To: <1612642.At0RDolh7h@xps>

Below is my conclusion for this bug.
An expert of x86 is required to follow-up.

Summary:
	- CPU: Intel Skylake
	- Linux environment: Ubuntu 18.04
	- Compiler: GCC 7 or 8
	- Scenario: testpmd crashes when it starts forwarding
	- Behaviour: AVX2 version of rte_memcpy() fails if optimized for AVX512
	- Context: inline rte_memcpy() is called from
			inline rte_mempool_put_bulk(), called from
			mlx5_tx_complete() (inline or not)
	- Analysis: AVX512 optimization changes vmovdqu to vmovdqu8

Latest status can be found in Bugzilla:
	https://bugs.dpdk.org/show_bug.cgi?id=97#c35

  parent reply	other threads:[~2018-11-10  2:13 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-23 21:23 [dpdk-dev] [PATCH] build: disable compiler AVX512F support Yongseok Koh
2018-11-01 23:11 ` Thomas Monjalon
2018-11-02 12:42 ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2018-11-02 13:48   ` Ferruh Yigit
2018-11-02 20:59     ` Yongseok Koh
2018-11-02 21:46       ` Ferruh Yigit
2018-11-02 23:31         ` Yongseok Koh
2018-11-02 21:04 ` [dpdk-dev] [PATCH v2] " Yongseok Koh
2018-11-05 14:06   ` Wiles, Keith
2018-11-06 21:30     ` Yongseok Koh
2018-11-07  9:04       ` Wiles, Keith
2018-11-08 15:59         ` [dpdk-dev] AVX512 bug on SkyLake Thomas Monjalon
2018-11-08 17:21           ` Ferruh Yigit
2018-11-08 23:01             ` Yongseok Koh
2018-11-09  6:27               ` Christian Ehrhardt
2018-11-09  9:49                 ` Ferruh Yigit
2018-11-09 11:35                   ` Thomas Monjalon
2018-11-09 10:03               ` Ferruh Yigit
2018-11-09 13:17                 ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2018-11-09 14:27                   ` Thomas Monjalon
2018-11-09 20:06                     ` Ferruh Yigit
2018-11-09 18:46           ` [dpdk-dev] " Stephen Hemminger
2018-11-10  2:13           ` Thomas Monjalon [this message]
2018-11-11 14:15             ` [dpdk-dev] [dpdk-stable] " Ananyev, Konstantin
2018-11-11 18:15               ` Thomas Monjalon
2018-11-12  9:09                 ` Christian Ehrhardt
2018-11-12  9:21                   ` Thomas Monjalon
2018-11-12  9:26                 ` Ananyev, Konstantin
2018-11-03  1:06 ` [dpdk-dev] [PATCH v3] build: disable gcc AVX512F support Yongseok Koh
2018-11-04 20:56   ` Thomas Monjalon

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