Re: [dpdk-users] Larger number of hugepages causes bus error.

[Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>]

Nevermind the 'root' question, given that it works with 256 hugepages :)

On 23/02/2017 15:18, Sergio Gonzalez Monroy wrote:
> That line is just setting to 0 a shared memory area where we store 
> hugepage information.
>
> Are you running as privileged user (ie. root)?
> What is the result of 'ulimit -aHS'?
>
> Thanks,
> Sergio
>
> On 23/02/2017 03:18, Sushil Adhikari wrote:
>> Thank you Keith for the response,
>>
>> Yes it should be line 1142 not 1405, I was using 16.11 and now I'm using
>> 17.02 and still getting the same error.
>>
>> On Wed, Feb 22, 2017 at 8:46 PM, Wiles, Keith <keith.wiles@intel.com> 
>> wrote:
>>
>>>> On Feb 22, 2017, at 6:43 PM, Wiles, Keith <keith.wiles@intel.com> 
>>>> wrote:
>>>>
>>>>> On Feb 22, 2017, at 6:30 PM, Sushil Adhikari <sushil446@gmail.com>
>>> wrote:
>>>>> I used the basic command line option "dpdkTimer -c 0xf -n 4"
>>>>> And to update on my findings so far I have narrowed down to this
>>> line(1405)
>>>>> memset(hugepage, 0, nr_hugefiles * sizeof(struct hugepage_file));
>>>>> of function rte_eal_hugepage_init() in file
>>> dpdk\lib\librte_eal\linuxapp\eal\eal_memory.c
>>>> What version of DPDK are you using? I was looking at the file at 1405
>>> and I do not see a memset() call.
>>>
>>> I found the memset call at 1142 in my 17.05-rc0 code. Please try the
>>> latest version and see if you get the same problem.
>>>
>>>>> Yes I have the hugepages of size 2MB(2048) and when I calculate the
>>> memory this memset function is trying to set, it comes out to
>>> 512(nr_hugefiles) * 4144 ( sizeof(struct hugepage_file) ) = 2121728 
>>> which
>>> larger than 2MB, so my doubt is that the hugepages I have
>>> allocated(512*2MB) is not contiguous 1GB memory its trying to access 
>>> memory
>>> thats not part of hugepage, is that a possibility, even though I am 
>>> setting
>>> up hugepages during boot time by providing it through kernel option.
>>>>>
>>>>> On Wed, Feb 22, 2017 at 8:05 PM, Wiles, Keith <keith.wiles@intel.com>
>>> wrote:
>>>>>> On Feb 22, 2017, at 3:05 PM, Sushil Adhikari <sushil446@gmail.com>
>>> wrote:
>>>>>> Hi,
>>>>>>
>>>>>> I was trying to run dpdk timer app by setting 512 2MB hugepages 
>>>>>> but the
>>>>>> application crashed with following error
>>>>>> EAL: Detected 4 lcore(s)
>>>>>> EAL: Probing VFIO support...
>>>>>> Bus error (core dumped)
>>>>>>
>>>>>> If I reduce the number of hugepages to 256 it works fine. I 
>>>>>> wondering
>>> what
>>>>>> could be the problem here. Here's my cpu info
>>>>> I normally run with 2048 x 2 or 2048 per socket on my machine. 
>>>>> What is
>>> the command line you are using to start the application?
>>>>>> processor       : 0
>>>>>> vendor_id       : GenuineIntel
>>>>>> cpu family      : 6
>>>>>> model           : 26
>>>>>> model name      : Intel(R) Core(TM) i7 CPU         950 @ 3.07GHz
>>>>>> stepping        : 5
>>>>>> microcode       : 0x11
>>>>>> cpu MHz         : 2794.000
>>>>>> cache size      : 8192 KB
>>>>>> physical id     : 0
>>>>>> siblings        : 4
>>>>>> core id         : 0
>>>>>> cpu cores       : 4
>>>>>> apicid          : 0
>>>>>> initial apicid  : 0
>>>>>> fpu             : yes
>>>>>> fpu_exception   : yes
>>>>>> cpuid level     : 11
>>>>>> wp              : yes
>>>>>> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep 
>>>>>> mtrr pge
>>> mca
>>>>>> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe 
>>>>>> syscall
>>> nx
>>>>>> rdtscp lm constant_tsc arch_
>>>>>> perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni
>>> dtes64
>>>>>> monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt
>>>>>> lahf_lm ida dtherm tpr_shadow vnm
>>>>>> i flexpriority ept vpid
>>>>>> bugs            :
>>>>>> bogomips        : 5600.00
>>>>>> clflush size    : 64
>>>>>> cache_alignment : 64
>>>>>> address sizes   : 36 bits physical, 48 bits virtual
>>>>>> power management:
>>>>>>
>>>>>> processor       : 1
>>>>>> vendor_id       : GenuineIntel
>>>>>> cpu family      : 6
>>>>>> model           : 26
>>>>>> model name      : Intel(R) Core(TM) i7 CPU         950 @ 3.07GHz
>>>>>> stepping        : 5
>>>>>> microcode       : 0x11
>>>>>> cpu MHz         : 2794.000
>>>>>> cache size      : 8192 KB
>>>>>> physical id     : 0
>>>>>> siblings        : 4
>>>>>> core id         : 1
>>>>>> cpu cores       : 4
>>>>>> apicid          : 2
>>>>>> initial apicid  : 2
>>>>>> fpu             : yes
>>>>>> fpu_exception   : yes
>>>>>> cpuid level     : 11
>>>>>> wp              : yes
>>>>>> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep 
>>>>>> mtrr pge
>>> mca
>>>>>> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe 
>>>>>> syscall
>>> nx
>>>>>> rdtscp lm constant_tsc arch_
>>>>>> perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni
>>> dtes64
>>>>>> monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt
>>>>>> lahf_lm ida dtherm tpr_shadow vnm
>>>>>> i flexpriority ept vpid
>>>>>> bugs            :
>>>>>> bogomips        : 5600.00
>>>>>> clflush size    : 64
>>>>>> cache_alignment : 64
>>>>>> address sizes   : 36 bits physical, 48 bits virtual
>>>>>> power management:......
>>>>>>
>>>>>> And Here's my meminfo
>>>>>>
>>>>>> MemTotal:       24679608 kB
>>>>>> MemFree:        24014156 kB
>>>>>> MemAvailable:   23950600 kB
>>>>>> Buffers:            3540 kB
>>>>>> Cached:            31436 kB
>>>>>> SwapCached:            0 kB
>>>>>> Active:            21980 kB
>>>>>> Inactive:          22256 kB
>>>>>> Active(anon):      10760 kB
>>>>>> Inactive(anon):     2940 kB
>>>>>> Active(file):      11220 kB
>>>>>> Inactive(file):    19316 kB
>>>>>> Unevictable:           0 kB
>>>>>> Mlocked:               0 kB
>>>>>> SwapTotal:             0 kB
>>>>>> SwapFree:              0 kB
>>>>>> Dirty:                32 kB
>>>>>> Writeback:             0 kB
>>>>>> AnonPages:          9252 kB
>>>>>> Mapped:            11912 kB
>>>>>> Shmem:              4448 kB
>>>>>> Slab:              27712 kB
>>>>>> SReclaimable:      11276 kB
>>>>>> SUnreclaim:        16436 kB
>>>>>> KernelStack:        2672 kB
>>>>>> PageTables:         1000 kB
>>>>>> NFS_Unstable:          0 kB
>>>>>> Bounce:                0 kB
>>>>>> WritebackTmp:          0 kB
>>>>>> CommitLimit:    12077660 kB
>>>>>> Committed_AS:     137792 kB
>>>>>> VmallocTotal:   34359738367 kB
>>>>>> VmallocUsed:           0 kB
>>>>>> VmallocChunk:          0 kB
>>>>>> HardwareCorrupted:     0 kB
>>>>>> AnonHugePages:      2048 kB
>>>>>> CmaTotal:              0 kB
>>>>>> CmaFree:               0 kB
>>>>>> HugePages_Total:     256
>>>>>> HugePages_Free:        0
>>>>>> HugePages_Rsvd:        0
>>>>>> HugePages_Surp:        0
>>>>>> Hugepagesize:       2048 kB
>>>>>> DirectMap4k:       22000 kB
>>>>>> DirectMap2M:    25133056 kB
>>>>> Regards,
>>>>> Keith
>>>>>
>>>>>
>>>> Regards,
>>>> Keith
>>> Regards,
>>> Keith
>>>
>>>
>