From: Liang Ma <liangma@liangbit.com>
To: Stephen Hemminger <stephen@networkplumber.org>
Cc: dev@dpdk.org, leyi.rong@intel.com,
Liang Ma <liangma@bytedance.com>,
stable@dpdk.org, Bruce Richardson <bruce.richardson@intel.com>,
Konstantin Ananyev <konstantin.ananyev@intel.com>
Subject: Re: [dpdk-dev] [PATCH] buildtools: Check GCC version to avoid GCC 6.3.0 avx512 bug
Date: Sun, 18 Jul 2021 10:33:15 +0100 [thread overview]
Message-ID: <YPP1W5HT1504J79j@C02F33EJML85> (raw)
In-Reply-To: <20210717180804.301f7876@hermes.local>
On Sat, Jul 17, 2021 at 06:08:04PM -0700, Stephen Hemminger wrote:
> On Sat, 17 Jul 2021 23:13:04 +0100
> Liang Ma <liangma@liangbit.com> wrote:
>
> > On Sat, Jul 17, 2021 at 10:48:49AM -0700, Stephen Hemminger wrote:
> > > On Sat, 17 Jul 2021 18:08:30 +0100
> > > Liang Ma <liangma@liangbit.com> wrote:
> > >
> > > > From: Liang Ma <liangma@bytedance.com>
> > > >
> > > > GCC 6.3.0 has a known bug which related to _mm512_extracti64x4_epi64.
> > > > Please reference https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82887
> > > >
> > > > Some DPDK PMD avx512 version heavily use _mm512_extracti64x4_epi6,
> > > > which casue building failure with debug buildtype.
> > > >
> > > > Therefore, it's helpful to disable avx512 for GCC 6.3.0
> > > >
> > > > Bugzilla ID: 717
> > > > Fixes: e6a6a138919f (net/i40e: add AVX512 vector path)
> > > > Fixes: 808a17b3c1e6 (net/ice: add Rx AVX512 offload path)
> > > > Fixes: 4b64ccb328c9 (net/iavf: fix VLAN extraction in AVX512 path)
> > > > Cc: stable@dpdk.org
> > > >
> > > > Reported-by: Liang Ma <liangma@liangbit.com>
> > > > Signed-off-by: Liang Ma <liangma@bytedance.com>
> > >
> > > What distro still has GCC 6.3.0?
> > For example Debian 9.x
>
> Ok, thanks. Is there a bug fix in Debian LTS yet?
I look into https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82887, and
find gcc community has no plan to backport fix. Hence, I don't think
Debian LTS will have any fix for this. That's why I send out this patch.
next prev parent reply other threads:[~2021-07-18 9:33 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-17 17:08 [dpdk-dev] [PATCH] buildtools: Check GCC version to avoid GCC 6.3.0 avx512 bug Liang Ma
2021-07-17 17:48 ` Stephen Hemminger
2021-07-17 22:13 ` Liang Ma
2021-07-18 1:08 ` Stephen Hemminger
2021-07-18 9:33 ` Liang Ma [this message]
2021-07-19 8:38 ` Bruce Richardson
2021-07-19 10:04 ` Liang Ma
2021-07-19 22:34 ` [dpdk-dev] [PATCH v2] build: check AVX512 rather than compiler version Liang Ma
2021-07-20 10:19 ` Bruce Richardson
2021-07-20 11:24 ` Liang Ma
2021-07-20 11:20 ` [dpdk-dev] [PATCH v3] " Liang Ma
2021-07-20 11:58 ` Bruce Richardson
2021-07-20 13:25 ` Liang Ma
2021-07-20 13:36 ` [dpdk-dev] [PATCH v4] build: check for broken AVX-512 compiler support Liang Ma
2021-07-22 17:58 ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YPP1W5HT1504J79j@C02F33EJML85 \
--to=liangma@liangbit.com \
--cc=bruce.richardson@intel.com \
--cc=dev@dpdk.org \
--cc=konstantin.ananyev@intel.com \
--cc=leyi.rong@intel.com \
--cc=liangma@bytedance.com \
--cc=stable@dpdk.org \
--cc=stephen@networkplumber.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.