Re: NUMA Autobalancing Kernel 3.8

[Stefan Priebe - Profihost AG <s.priebe@profihost.ag>]

Am 08.04.2013 10:13, schrieb Mel Gorman:
> On Fri, Apr 05, 2013 at 02:10:32PM +0200, Stefan Priebe - Profihost AG wrote:
>> Am 05.04.2013 14:00, schrieb Mel Gorman:
>>> On Wed, Apr 03, 2013 at 04:11:24PM +0200, Stefan Priebe - Profihost AG wrote:
>>>> Am 03.04.2013 16:03, schrieb Mel Gorman:
>>>>>> I've now tested 3.9-rc5 this gaves me a slightly different kernel log:
>>>>>> [  197.236518] pigz[2908]: segfault at 0 ip           (null) sp
>>>>>> 00007f347bffed00 error 14
>>>>>> [  197.237632] traps: pigz[2915] general protection ip:7f3482dbce2d
>>>>>> sp:7f3473ffec10 error:0 in libz.so.1.2.3.4[7f3482db7000+17000]
>>>>>> [  197.330615]  in pigz[400000+10000]
>>>>>>
>>>>>> With 3.8 it is the same as with 3.8.4 or 3.8.5.
>>>>>>
>>>>>
>>>>> Ok. Are there NUMA machines were you do *not* see this problem?
>>>> Sadly no.
>>>>
>>>> I can really fast reproduce it with this one:
>>>> 1.) Machine with only 16GB Mem
>>>> 2.) compressing two 60GB Files in parallel with pigz consuming all cores
>>>>
>>>
>>> Ok, I'm dealing with this slower than I'd like due to an unfortunate
>>> abundance of bugs right now. I am putting together a reproduction case but
>>> I still can't trigger it unfortunately. Can you post your .config in case
>>> it's my kernel config that is the reason I can't see the problem please?
>>
>> no problem. Attaches is my kernel config.
>>
> 
> It does indeed appear that the kernel configuration is a factor.  Can you
> try applying the following to your .config please?
> 
> --- config-bad  2013-04-07 21:08:02.213112445 +0100
> +++ .config     2013-04-07 23:28:09.275973625 +0100
> @@ -2518,8 +2518,8 @@
>  CONFIG_TMPFS=y
>  CONFIG_TMPFS_POSIX_ACL=y
>  CONFIG_TMPFS_XATTR=y
> -# CONFIG_HUGETLBFS is not set
> -# CONFIG_HUGETLB_PAGE is not set
> +CONFIG_HUGETLBFS=y
> +CONFIG_HUGETLB_PAGE=y
>  CONFIG_CONFIGFS_FS=y
>  CONFIG_MISC_FILESYSTEMS=y
>  # CONFIG_ADFS_FS is not set

Yes this works!

Stefan

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