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From: Christian Ehrhardt <christian.ehrhardt@canonical.com>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>,
	Ferruh Yigit <ferruh.yigit@intel.com>,
	 Bruce Richardson <bruce.richardson@intel.com>,
	stable@dpdk.org, keith.wiles@intel.com,  yskoh@mellanox.com,
	dev <dev@dpdk.org>, Shahaf Shuler <shahafs@mellanox.com>,
	 anatoly.burakov@intel.com, justin.parus@microsoft.com,
	 David Coronel <david.coronel@canonical.com>,
	Josh Powers <josh.powers@canonical.com>,
	 Jay Vosburgh <jay.vosburgh@canonical.com>,
	Dan Streetman <dan.streetman@canonical.com>
Subject: Re: [dpdk-dev] [dpdk-stable] AVX512 bug on SkyLake
Date: Mon, 12 Nov 2018 10:09:13 +0100	[thread overview]
Message-ID: <CAATJJ0JmoMup+LL2-4Z8AJ29tzXFO+97_OKwW4M4NRR4EKVjFg@mail.gmail.com> (raw)
In-Reply-To: <14171327.rkP5k0YJWv@xps>

> -    vmovdqu8 xmm0,XMMWORD PTR [rax*8+0x6]
> +    vmovdqu xmm0,XMMWORD PTR [rax*8+0x60]
>      vinserti128 ymm0,ymm0,XMMWORD PTR [rax*8+0x70],0x1
>      vmovups XMMWORD PTR [rsi+0x60],xmm0
>      vextracti128 XMMWORD PTR [rsi+0x70],ymm0,0x1
>
> > Not sure what causing compiler behaves that way.
> > BTW, looking though testpmd objdump output - it seems that only mlx5 driver
> > exhibits such problem (I didn't enable mlx4 actually, probably same problem here).
> > Which looks a bit weird to me.
>
> Yes it's weird. I don't see how the mlx5 code could influence
> the compiler to generate this bad code in AVX512 mode.

Thomas you have all this set up, do you have any chance to test this
on the GCC's in Ubuntu 18.10 and 19.04
If easy I'd love to see results wit hgcc-7 & gcc-8 as in Ubuntu 19.04
(current -dev).
If the above is too hard, at least could you try the gcc-8 in Bionic
is 8.2.0-1ubuntu2~18.04 that is rather close.

If you could share the simplified build options that you need to
reproduce that would help (at least me) - thanks in advance

-- 
Christian Ehrhardt
Software Engineer, Ubuntu Server
Canonical Ltd

  reply	other threads:[~2018-11-12  9:09 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           ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2018-11-11 14:15             ` Ananyev, Konstantin
2018-11-11 18:15               ` Thomas Monjalon
2018-11-12  9:09                 ` Christian Ehrhardt [this message]
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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