freebsd stable - Nov 2017 - Re: Intel I210 (igb) sometimes consume all CPU on not-so-big traffic — need help!

On 09.11.2017 23:17, Lev Serebryakov wrote:

  Looks like I know where it spent all time. I've used 'pmcstat' and
got
very suspicious flamegraph. Looks like problem is on codepath which lies
through

igb_refresh_mbufs
m_getjcl
uma_zalloc_arg
[zone_alloc_item]
zone_import
zone_fetch_slab
keg_fetch_slab
keg_alloc_slab
mbuf_jumbo_alloc
kmem_alloc_contig
vm_page_reclaim_contig
vm_phys_scan_contig
vm_page_scan_contig

zone_alloc_item is optional, it presents 50% of time, otherwise path is
one step shorter.

-- 
// Lev Serebryakov

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Please try the following patch.  It should resolve your issue:

https://people.freebsd.org/~rstone/patches/e1000-9k.diff