Re: [CentOS] C 7: smpboot: CPU 16 is now offline, and slabs...

m.roth@5-cent.us wrote:

Current kernel, and I just booted, and dmesg shows, of the 32 cores, 0, 2, 4 and 6 ok, and *all* other show "is now offline.

What's happening here?

A followup: I also find a core in /var/spool/abrt, and "reason" is kernel BUG at mm/slub.c:3601!

In googling, I see threads about incorrect calculation of slabs. Following one thread, I find cat /sys/kernel/slab/:t-0000048/cpu_slabs

gives me

4 N0=4

Meanwhile, slabtop shows Active / Total Slabs (% used) : 25927 / 25927 (100.0%)

Which changes, but just varying around that number, and st 100%.

So: should I increase the number of slabs, using the kernel parm of swiotlb, and if so, for what I show above, should I set it to, say, 32000?

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