[dpdk-users] Larger number of hugepages causes bus error.
Sergio Gonzalez Monroy
sergio.gonzalez.monroy at intel.com
Thu Feb 23 16:20:37 CET 2017
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 at intel.com>
>> wrote:
>>
>>>> On Feb 22, 2017, at 6:43 PM, Wiles, Keith <keith.wiles at intel.com>
>>>> wrote:
>>>>
>>>>> On Feb 22, 2017, at 6:30 PM, Sushil Adhikari <sushil446 at 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 at intel.com>
>>> wrote:
>>>>>> On Feb 22, 2017, at 3:05 PM, Sushil Adhikari <sushil446 at 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
>>>
>>>
>
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