I still have problems with my E-1220v3 server equipped with Intel I210 adapter. It can not be loaded more than 100Mbit/s because it is connection to internet.
But sometimes four interrupt threads "intr{irqXXX: igb0:que Y}" consume
100% CPU. Interrupt rate is very modest:
% vmstat -i
interrupt total rate
...
irq276: igb0:que 0 851899713 1193
irq277: igb0:que 1 907338150 1271
irq278: igb0:que 2 907538207 1271
irq279: igb0:que 3 768217584 1076
irq280: igb0:link 2 0
%
But CPU consumption is 90-100% per thread:
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
11 root -92 - 0K 544K CPU2 2 146:22 98.30% intr{irq278:
igb0:que 2}
11 root -92 - 0K 544K WAIT 0 178:18 81.55% intr{irq276:
igb0:que 0}
11 root -92 - 0K 544K WAIT 1 135:34 77.77% intr{irq277:
igb0:que 1}
11 root -92 - 0K 544K CPU3 3 138:57 67.50% intr{irq279:
igb0:que 3}
procstat -ak looks suspicious:
% sudo procstat -ak | grep igb0:que
11 100056 intr irq276: igb0:que 0 vm_page_scan_contig
vm_phys_scan_contig vm_page_reclaim_contig kmem_alloc_contig
mbuf_jumbo_alloc keg_alloc_slab keg_fetch_slab zone_fetch_slab
zone_import zone_alloc_item uma_zalloc_arg m_getjcl igb_refresh_mbufs
igb_rxeof igb_msix_que intr_event_execute_handlers ithread_loop fork_exit
11 100058 intr irq277: igb0:que 1 mi_switch ithread_loop fork_exit
fork_trampoline
11 100060 intr irq278: igb0:que 2 mi_switch ithread_loop fork_exit
fork_trampoline
11 100062 intr irq279: igb0:que 3 mi_switch ithread_loop fork_exit
fork_trampoline
%
--
// Lev Serebryakov
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