Rick Jones a écrit :

quoted

Thanks for the report

If you have so much contention on spinlocks, maybe hash function is 
not good at all...

hash = (unsigned long)ct;
hash ^= hash >> 16;
hash ^= hash >> 8;

I ass-u-me you compiled your kernel with NR_CPUS=32 ?

I believe so - CONFIG_NR_CPUS in .config is 64 anyway.  If there is a 
more definitive place to check I'd be happy to look.

rick

By any chance, are you using SLAB instead of SLUB ?

While running your netperf session, issuing :

grep conntrack /proc/slabinfo

Would help to know hash dispertion on your machine.