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From: Thomas Monjalon <thomas@monjalon.net>
To: Christian Ehrhardt <christian.ehrhardt@canonical.com>
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-stable] AVX512 bug on SkyLake
Date: Mon, 12 Nov 2018 10:21:56 +0100	[thread overview]
Message-ID: <1966988.vJfdJNsEgr@xps> (raw)
In-Reply-To: <CAATJJ0JmoMup+LL2-4Z8AJ29tzXFO+97_OKwW4M4NRR4EKVjFg@mail.gmail.com>

12/11/2018 10:09, Christian Ehrhardt:
> > -    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.

I already tested updated GCC 7 and 8 (it is the same result):
	https://bugs.dpdk.org/show_bug.cgi?id=97#c18

Versions are:
	gcc-7 (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
	gcc-8 (Ubuntu 8.2.0-1ubuntu2~18.04) 8.2.0

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

You just need to compile mlx5, nothing special.

  reply	other threads:[~2018-11-12  9:22 UTC|newest]

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

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