Re: [dpdk-dev] [PATCH v3 0/6] use IOVAs check based on DMA mask

["Burakov, Anatoly" <anatoly.burakov@intel.com>]

On 30-Oct-18 2:04 PM, Alejandro Lucero wrote:
> 
> 
> On Tue, Oct 30, 2018 at 12:37 PM Alejandro Lucero 
> <alejandro.lucero@netronome.com <mailto:alejandro.lucero@netronome.com>> 
> wrote:
> 
> 
> 
>     On Tue, Oct 30, 2018 at 12:22 PM Lin, Xueqin <xueqin.lin@intel.com
>     <mailto:xueqin.lin@intel.com>> wrote:
> 
>         Some found on some our servers:____
> 
>         If  not add ”intel_iommu=on iommu=pt” in /boot/grub2/grub.cfg
>         file, then reboot to make it effective.____
> 
>         18.11 rc1: Success to setup testpmd  and secondary process.____
> 
>         __ __
> 
>         If  add  ”intel_iommu=on iommu=pt” in /boot/grub2/grub.cfg file,
>         then reboot to make it effective.____
> 
>         18.11 rc1:  Fail to setup testpmd  and secondary process.____
> 
>         18.11 rc1+ dma_mask_fix patch: success to setup testpmd, but
>         fail to setup secondary process.____
> 
>         __ __
> 
>         Maybe ”intel_iommu=on iommu=pt” enable or not result in our test
>         gap. ____
> 
>         Most of our team servers should enable the IOMMU for VT-d and
>         vfio test. ____
> 
>         __
> 
> 
>     It makes sense because the problem is when the IOVA mode is set
>     inside drivers/bus/pci/linux/pci.c and if there is not IOMMU, not
>     call to rte_eal_check_dma_mask at all.
> 
>         __
> 
>         Best regards,____
> 
>         Xueqin____
> 
>         __ __
> 
>         *From:*Alejandro Lucero [mailto:alejandro.lucero@netronome.com
>         <mailto:alejandro.lucero@netronome.com>]
>         *Sent:* Tuesday, October 30, 2018 6:38 PM
>         *To:* Lin, Xueqin <xueqin.lin@intel.com
>         <mailto:xueqin.lin@intel.com>>
>         *Cc:* Yao, Lei A <lei.a.yao@intel.com
>         <mailto:lei.a.yao@intel.com>>; Thomas Monjalon
>         <thomas@monjalon.net <mailto:thomas@monjalon.net>>; dev
>         <dev@dpdk.org <mailto:dev@dpdk.org>>; Xu, Qian Q
>         <qian.q.xu@intel.com <mailto:qian.q.xu@intel.com>>; Burakov,
>         Anatoly <anatoly.burakov@intel.com
>         <mailto:anatoly.burakov@intel.com>>; Yigit, Ferruh
>         <ferruh.yigit@intel.com <mailto:ferruh.yigit@intel.com>>; Zhang,
>         Qi Z <qi.z.zhang@intel.com <mailto:qi.z.zhang@intel.com>>
>         *Subject:* Re: [dpdk-dev] [PATCH v3 0/6] use IOVAs check based
>         on DMA mask____
> 
>         __ __
> 
>         __ __
> 
>         On Tue, Oct 30, 2018 at 10:34 AM Lin, Xueqin
>         <xueqin.lin@intel.com <mailto:xueqin.lin@intel.com>> wrote:____
> 
>             Hi Lucero,____
> 
>             ____
> 
>             No, we have reproduced multi-process issues(include
>             symmetric_mp, simple_mp, hotplug_mp, multi-process unit
>             test… )on most of our servers. ____
> 
>             It is also strange that 1~2 servers don’t have the issue.____
> 
>             ____
> 
>         __ __
> 
>         Yes, you are right. I could execute it but it was due to how
>         this problem triggers. ____
> 
>         I think I can fix this and at the same time solving properly the
>         initial issue without any limitation like that potential race
>         condition I mentioned. ____
> 
>         I can give you a patch to try in a couple of hours. ____
> 
>         __
> 
> 
> Hi Lin,
> 
> Can you try the patch attached?
> 
> Thanks
> 
Hi Alejandro,

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-- 
Thanks,
Anatoly