Re: [dpdk-dev] running dpdk 2.1 on openstak causes CPU soft lockup

[Nissim Nisimov <NissimN@Radware.com>]

Yup this is exactly our issue.

We blacked list the specific interface and its working again.

Thx
Nissim

-----Original Message-----
From: Franck BAUDIN [mailto:Franck.BAUDIN@qosmos.com] 
Sent: Tuesday, December 01, 2015 2:20 PM
To: Nissim Nisimov; dev@dpdk.org
Subject: RE: running dpdk 2.1 on openstak causes CPU soft lockup

> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Nissim Nisimov
> Sent: lundi 23 novembre 2015 20:44
> To: dev@dpdk.org
> Subject: [dpdk-dev] running dpdk 2.1 on openstak causes CPU soft 
> lockup
>
> Hi,
>
> I am running DPDK 2.1.0 based app on OpenStack KVM guest.  OS of guest 
> is Ubuntu LTS 14.04 3.13 kernel.
> virtio.
>
> After upgrade to dpdk 2.1 (previous version was dpdk 1.8 and it worked 
> fine) we are seeing the following issue:
>
> [960.004535] BUG: soft lockup - CPU#3 stuck for 23s! [ip:8419]
>
> The message will be printed in an endless loop and the system won't 
> recover.
>
> Is it a known issue in dpdk 2.1? any patch I can apply in order to 
> overcome this?
>
>
> Thx
> Nissim

Do you have virtIO interfaces in your guest, with at least one (usually the first one, used for cloud-init) used by the kernel? If so,  even if they are in use by the kernel, DPDK virtIO driver will attach to them (without detaching the kernel), leading to either kernel crash or infinite loops. Until DPDK 1.8.0 included, you had to explicitly bind the virtIO interfaces, via igb_uio. But since DPDK 2.x, all non-blacklisted interfaces are bound.

Franck
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