Hi, after upgrading to 4.4.x kernel, I noticed performance dropped considerably.
while investigating using perf, I noticed
e1000_power_down_phy_copper_80003es2lan
seems to be suspiciously active:
samples pcnt function DSO
_______ _____ _______________________________________
___________________________________________________________________________
1467.00 37.2% e1000_power_down_phy_copper_80003es2lan
/lib/modules/4.4.6lb6.01/kernel/drivers/net/ethernet/intel/e1000e/e1000e.ko
287.00 7.3% ipt_register_table
/lib/modules/4.4.6lb6.01/kernel/net/ipv4/netfilter/ip_tables.ko
127.00 3.2% do_raw_spin_lock
[kernel.kallsyms]
70.00 1.8% exp_seq_next
/lib/modules/4.4.6lb6.01/kernel/net/netfilter/nf_conntrack.ko
64.00 1.6% lzma_decode
/usr/lib64/liblzma.so.0.0.0
60.00 1.5% fib_table_lookup
[kernel.kallsyms]
54.00 1.4% flow_cache_lookup
[kernel.kallsyms]
my question is whether this is expected or some known issue?
hardware is quite old, with 4 onboard interfaces:
05:00.0 Ethernet controller: Intel Corporation 82573E Gigabit Ethernet
Controller (Copper) (rev 03)
07:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet
Controller
09:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet
Controller
0b:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet
Controller
If I could provide any further info, please let me know.
BR
nik
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