Hi， I did a network forward test with ovs-dpdk, and found that LLC cache miss increases with the increases of hugepages. ovs-dpdk only use 4 hugepages, hugepage size is 1G.Why LLC cache miss increases ? I just echo more hugepages but haven't been used yet.
some informations: CPU: Intel(R) Xeon(R) CPU E5-2620 v3@ 2.40GHz L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 15360K echo 10 > /proc/sys/vm/nr_hugepages ovs-dpdk's LLC-load-misses:3.88% ovs-dpdk's iTLB-load-misses: 4.37% echo 100 > /proc/sys/vm/nr_hugepages reboot VM restart test. ovs-dpdk's LLC-load-misses:31.55% ovs-dpdk's iTLB-load-misses: 36.36% I use perf to watch LLC-loads when not run test: Samples: 1M of event 'LLC-loads', Event count (approx.): 57240206 Overhead Shared Object Symbol 9.19% [kernel] [k] copy_page_rep 5.03% [kernel] [k] ktime_get 4.06% [unknown] [.] 0x000000000043e39d 2.65% bash [.] 0x000000000003e39d 2.13% [kernel] [k] rcu_check_callbacks The function copy_page_rep seems like would prefetch all hugepages?
