[dpdk-users] Larger number of hugepages causes bus error.
Sushil Adhikari
sushil446 at gmail.com
Thu Feb 23 03:30:33 CET 2017
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
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
>
>
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