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

[Wiles, Keith]

> 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