Hello.
I'm using r214746 FreeBSD system as a home fileserver/router, with
athlon xp mobile onboard:
CPU: mobile AMD Athlon(tm) XP 2200+ (1800.10-MHz 686-class CPU)
Origin = "AuthenticAMD" Id = 0x681 Family = 6 Model = 8
Stepping = 1
Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
AMD Features=0xc0480800<SYSCALL,MP,MMX+,3DNow!+,3DNow!>
I've set powerd in rc.conf:
powerd_enable="YES"
powerd_flags="-a hadp -b hadp -n max"
And it seems to work as intended:
# sysctl -a | grep cpu
kern.ccpu: 0
kern.sched.cpusetsize: 4
kern.smp.cpus: 1
kern.smp.maxcpus: 1
net.inet.tcp.per_cpu_timers: 0
debug.cpufreq.verbose: 0
debug.cpufreq.lowest: 0
hw.ncpu: 1
hw.acpi.cpu.cx_lowest: C1
security.jail.param.cpuset.id: 0
dev.cpu.0.%desc: ACPI CPU
dev.cpu.0.%driver: cpu
dev.cpu.0.%location: handle=\_PR_.CPU1
dev.cpu.0.%pnpinfo: _HID=none _UID=0
dev.cpu.0.%parent: acpi0
dev.cpu.0.freq: 787
dev.cpu.0.freq_levels: 1800/-1 1687/-1 1575/-1 1462/-1 1350/-1
1237/-1 1125/-1 1012/-1 900/-1 787/-1 675/-1 562/-1 450/-1 337/-1
225/-1 112/-1
dev.cpu.0.cx_supported: C1/0
dev.cpu.0.cx_lowest: C1
dev.cpu.0.cx_usage: 100.00% last 834us
dev.acpi_throttle.0.%parent: cpu0
dev.cpufreq.0.%driver: cpufreq
dev.cpufreq.0.%parent: cpu0
PC is connected to home network via 3Com NIC:
xl0: <3Com 3c905B-TX Fast Etherlink XL> port 0xec00-0xec7f mem
0xdfffff80-0xdfffffff irq 17 at device 6.0 on pci0
miibus0: <MII bus> on xl0
xlphy0: <3Com internal media interface> PHY 0 on miibus0
xlphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
xlphy1: <3Com internal media interface> PHY 24 on miibus0
xlphy1: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
xl0: Ethernet address: 00:50:da:d8:23:cd
# ifconfig xl0
xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=82009<RXCSUM,VLAN_MTU,WOL_MAGIC,LINKSTATE>
ether 00:50:da:d8:23:cd
inet 192.168.0.1 netmask 0xffffff00 broadcast 192.168.0.255
inet6 fe80::250:daff:fed8:23cd%xl0 prefixlen 64 scopeid 0x1
nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
Now here's the problem:
When I try to write a file on a samba share on this PC while it's idle,
I got ridiculous throughput like 6-120kB/s on 100Mbit link, but If
machine is busy, speed increase to 5-6 MB/s. It seems that throughput is
limited by CPU frequency and powerd doesn't increase cpu frequency level
in this case (I suppose that if CPU is set at very low frequency, it's
dealing mostly with interrupt requests from NIC). Is it expected
behaviour? I hope not because it makes powerd useless on fileserver ;)
If it's worth anything this is ZFS-only RAIDZ system with 1GB RAM.
--
Bartosz Stec
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