From: Bruce Richardson <bruce.richardson@intel.com>
To: Thomas Monjalon <thomas@monjalon.net>
Cc: Qi Zhang <qi.z.zhang@intel.com>,
dev@dpdk.org, jingjing.wu@intel.com, helin.zhang@intel.com,
wenzhuo.lu@intel.com, jing.d.chen@intel.com,
ferruh.yigit@intel.com
Subject: Re: [dpdk-dev] [PATCH 0/3 v2] disable vector PMD for i686
Date: Fri, 28 Apr 2017 10:26:17 +0100 [thread overview]
Message-ID: <20170428092617.GA14648@bricha3-MOBL3.ger.corp.intel.com> (raw)
In-Reply-To: <1655942.nOeDIEQQQZ@xps>
On Fri, Apr 28, 2017 at 11:14:24AM +0200, Thomas Monjalon wrote:
> 27/04/2017 11:25, Bruce Richardson:
> > On Thu, Apr 27, 2017 at 03:01:04AM -0400, Qi Zhang wrote:
> > > Vector PMD is not designed for i686 orginally, but it still can be active
> > > with i686 compile option.
> > > Below are observed failure when vPMD is invovled on i686
> > > (but may not limited to)
> > >
> > > 1) memory overwrite when assign 2 mbuf points to rx return points.
> > > _mm_storeu_si128((__m128i *)&rx_pkts[pos+2], mbp2)
> >
> > Is this a serious issue that prevents us using the driver? I think it's been
> > in the code for quite some time. Can it not be relatively easily fixed for
> > 32-bit builds?
> >
> > >
> > > 2) rearm_data is not 16 bytes aligned that cause general-protection exception
> > > _mm_store_si128((__m128i *)&rx_pkts[0]->rearm_data, rearm0);
> > >
> >
> > Good catch. I think this is also an easy fix. My preferred fix is to
> > explicitly align the rearm data on a 16-byte boundary. It would add some
> > padding to the middle of cacheline0 of the mbuf, but given that we
> > explicitly move other data to cacheline1, we will have padding on 32-bit
> > anyway, be it in the middle or the end of the mbuf cachelines.
> >
> > > So the patch set will exclude Vector PMD from compile with i686 configure.
>
> Please try to fix the drivers instead of turning them off.
The patch for alignment of physical addresses should fix these issues,
removing the need for these patches.
/Bruce
next prev parent reply other threads:[~2017-04-28 9:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-24 14:58 [dpdk-dev] [PATCH 0/3] " Qi Zhang
2017-04-24 14:58 ` [dpdk-dev] [PATCH 1/3] net/i40e: " Qi Zhang
2017-04-24 14:58 ` [dpdk-dev] [PATCH 2/3] net/ixgbe: " Qi Zhang
2017-04-24 14:58 ` [dpdk-dev] [PATCH 3/3] net/fm10k: " Qi Zhang
2017-04-27 7:01 ` [dpdk-dev] [PATCH 0/3 v2] " Qi Zhang
2017-04-27 7:01 ` [dpdk-dev] [PATCH 1/3 v2] net/i40e: " Qi Zhang
2017-04-27 7:01 ` [dpdk-dev] [PATCH 2/3 v2] net/ixgbe: " Qi Zhang
2017-04-27 7:01 ` [dpdk-dev] [PATCH 3/3 v2] net/fm10k: " Qi Zhang
2017-04-27 9:25 ` [dpdk-dev] [PATCH 0/3 v2] " Bruce Richardson
2017-04-28 9:14 ` Thomas Monjalon
2017-04-28 9:26 ` Bruce Richardson [this message]
2017-04-28 9:34 ` Ferruh Yigit
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=20170428092617.GA14648@bricha3-MOBL3.ger.corp.intel.com \
--to=bruce.richardson@intel.com \
--cc=dev@dpdk.org \
--cc=ferruh.yigit@intel.com \
--cc=helin.zhang@intel.com \
--cc=jing.d.chen@intel.com \
--cc=jingjing.wu@intel.com \
--cc=qi.z.zhang@intel.com \
--cc=thomas@monjalon.net \
--cc=wenzhuo.lu@intel.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).