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

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

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
>>
>>