C2/C3 states cause poor TCP performance with re(4)

[Aragon Gouveia]

On 03/13/11 09:02, Aragon Gouveia wrote:
> This system is tuned using mav@'s tuning guide:
>
> http://wiki.freebsd.org/TuningPowerConsumption

Additional info:

8.2-RELEASE

# grep ^re0 /var/run/dmesg.boot
re0: <RealTek 8168/8111 B/C/CP/D/DP/E PCIe Gigabit Ethernet> port 
0xe800-0xe8ff mem 0xfafff000-0xfaffffff,0xfaff8000-0xfaffbfff irq 18 at 
device 0.0 on pci3
re0: Using 1 MSI messages
re0: Chip rev. 0x28000000
re0: MAC rev. 0x00000000
re0: Ethernet address: 00:01:2e:2f:82:7f
re0: [FILTER]

# cat /boot/loader.conf
autoboot_delay="4"
hw.pci.do_power_nodriver=3
kern.hz="100"
hint.p4tcc.0.disabled="1"
hint.acpi_throttle.0.disabled="1"
hint.apic.0.clock="0"
hint.atrtc.0.clock="0"
hint.ahcich.0.pm_level=3
hint.ahcich.1.pm_level=3
hint.ahcich.2.pm_level=3
hint.ahcich.3.pm_level=3
hint.ahcich.4.pm_level=3
hint.ahcich.5.pm_level=3
hint.ahcich.6.pm_level=3

dev.cpu.0.freq: 1200
dev.cpu.0.freq_levels: 3200/73000 3067/64000 2933/58000 2800/52000 
2667/47000 2533/43000 2400/38000 2267/34000 2133/30000 2000/28000 
1867/25000 1733/23000 1600/21000 1467/19000 1333/18000 1200/16000
dev.cpu.0.cx_supported: C1/32 C2/96 C3/128
dev.cpu.0.cx_lowest: C3
dev.cpu.0.cx_usage: 0.08% 0.02% 99.89% last 3939us