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

[Sushil Adhikari]

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
>
>