linux-kernel - Re: [BUG] mellanox IB driver fails to load on large config

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Date:	Wed, 15 Jul 2015 14:33:33 +0300
From:	Matan Barak <matanb@...lanox.com>
To:	Alex Thorlton <athorlton@....com>,
	Or Gerlitz <gerlitz.or@...il.com>
CC:	andrew banman <abanman@....com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Doug Ledford <dledford@...hat.com>,
	"Sean Hefty" <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	"Or Gerlitz" <ogerlitz@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	Roland Dreier <roland@...estorage.com>,
	Moni Shoua <monis@...lanox.com>,
	"Jack Morgenstein" <jackm@....mellanox.co.il>,
	Yishai Hadas <yishaih@...lanox.com>,
	Eran Ben Elisha <eranbe@...lanox.com>,
	Ira Weiny <ira.weiny@...el.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: Re: [BUG] mellanox IB driver fails to load on large config



On 7/14/2015 11:28 PM, Alex Thorlton wrote:
> On Tue, Jul 14, 2015 at 11:06:26PM +0300, Or Gerlitz wrote:
>> On Tue, Jul 14, 2015 at 9:48 PM, Alex Thorlton <athorlton@....com> wrote:
>>> On Tue, Jul 14, 2015 at 01:22:34PM -0500, andrew banman wrote:
>>>> On Sat, Jul 11, 2015 at 11:20:19PM +0300, Or Gerlitz wrote:
>>>>> On Fri, Jul 10, 2015 at 10:15 PM, andrew banman <abanman@....com> wrote:
>>>>>> I'm seeing a large number of allocation errors originating from the Mellanox IB
>>>>>> driver when booting the 4.2-rc1 kernel on a 4096cpu 32TB memory system:
>>>>>
>>>>> Just to make sure, mlx4 works fine on this small (...) system with 4.1
>>>>> and 4.2-rc1 breaks, or 4.2-rc1 is the 1st time you're trying that
>>>>> config?
>>>>
>>>> I'll let Alex comment on that, he did some testing on that.
>>>
>>> I started seeing this on a 4.1-rc8 kernel, so it's been around for a
>>> little while.  It may have been around before 4.1-rc8, but I haven't run
>>> any kernels older than that on the big machine for some time.
>>
>> To make sure I am correctly following, on 4.1-rc8  you also see
>> something, right?
>
> Yes, that's correct.
>
>> are these the same messages or different ones? if the latter send to us.
>
> We see the same exact messages on 4.1-rc8.

Hi,

We don't recall getting those error with 32cpu machines, but we'll try 
to reproduce this issue.

Matan

>
> Thanks for looking into this!
>
> - Alex
>
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