I just want to add a data-point and report that the force-hpet patch(es) are
working on my VIA EPIA EN12000EG (VT8237-based) with kernel 2.6.22.1-hrt3.
Hope to see this in mainline soon.
# dmesg | grep -i hpet
Force enabled HPET at base address 0xfed00000
hpet clockevent registered
Time: hpet clocksource has been installed.
# powertop1.7
Cn Avg residency (20s) P-states (frequencies)
C0 (cpu running) (10.2%)
C1 0.0ms ( 0.0%) 1197 Mhz 0.5%
C2 61.9ms (89.8%) 399 Mhz 99.5%
C3 0.0ms ( 0.0%)
Wakeups-from-idle per second : 17.4
Top causes for wakeups:
20.1% ( 6.7) python : schedule_timeout (process_timeout)
14.4% ( 4.8) bash : queue_delayed_work_on
(delayed_work_timer_fn)
14.2% ( 4.7) <kernel core> : sk_reset_timer (tcp_keepalive_timer)
14.2% ( 4.7) postmaster : schedule_timeout (process_timeout)
7.3% ( 2.4) irssi : schedule_timeout (process_timeout)
6.3% ( 2.1) <interrupt> : sata_via
6.0% ( 2.0) <kernel core> : run_timer_softirq (keyScrubTimerFn)
4.7% ( 1.6) <interrupt> : eth0
3.0% ( 1.0) ntpd : do_setitimer (it_real_fn)
2.9% ( 0.9) apache2 : schedule_timeout (process_timeout)
1.4% ( 0.5) <kernel core> : queue_delayed_work_on
(delayed_work_timer_fn)
0.9% ( 0.3) <kernel core> : irlmp_init (irlmp_discovery_timer_expired)
0.8% ( 0.2) <kernel core> : neigh_table_init_no_netlink
(neigh_periodic_timer)
0.6% ( 0.2) md0_raid1 : schedule_timeout (process_timeout)
(I never see any C3 action. There's a "enable C4" option in the BIOS, but I've
never been
able to boot with it enabled (req. some fiddling around in the box too))
# lspci -nn
00:00.0 Host bridge [0600]: VIA Technologies, Inc. CN700/VN800/P4M800CE/Pro
Host Bridge [1106:0314]
00:00.1 Host bridge [0600]: VIA Technologies, Inc. CN700/VN800/P4M800CE/Pro
Host Bridge [1106:1314]
00:00.2 Host bridge [0600]: VIA Technologies, Inc. CN700/VN800/P4M800CE/Pro
Host Bridge [1106:2314]
00:00.3 Host bridge [0600]: VIA Technologies, Inc. PT890 Host Bridge [1106:3208]
00:00.4 Host bridge [0600]: VIA Technologies, Inc. CN700/VN800/P4M800CE/Pro
Host Bridge [1106:4314]
00:00.7 Host bridge [0600]: VIA Technologies, Inc. CN700/VN800/P4M800CE/Pro
Host Bridge [1106:7314]
00:01.0 PCI bridge [0604]: VIA Technologies, Inc. VT8237 PCI Bridge [1106:b198]
00:0d.0 FireWire (IEEE 1394) [0c00]: VIA Technologies, Inc. IEEE 1394 Host
Controller [1106:3044] (rev 80)
00:0e.0 Ethernet controller [0200]: VIA Technologies, Inc. VT6120/VT6121/VT6122
Gigabit Ethernet Adapter [1106:3119] (rev 11)
00:0f.0 IDE interface [0101]: VIA Technologies, Inc. VIA VT6420 SATA RAID
Controller [1106:3149] (rev 80)
00:0f.1 IDE interface [0101]: VIA Technologies, Inc.
VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE [1106:0571] (rev 06)
00:10.0 USB Controller [0c03]: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller [1106:3038] (rev 81)
00:10.1 USB Controller [0c03]: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller [1106:3038] (rev 81)
00:10.2 USB Controller [0c03]: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller [1106:3038] (rev 81)
00:10.4 USB Controller [0c03]: VIA Technologies, Inc. USB 2.0 [1106:3104] (rev
86)
00:11.0 ISA bridge [0601]: VIA Technologies, Inc. VT8237 ISA bridge
[KT600/K8T800/K8T890 South] [1106:3227]
00:11.5 Multimedia audio controller [0401]: VIA Technologies, Inc.
VT8233/A/8235/8237 AC97 Audio Controller [1106:3059] (rev 60)
00:14.0 Network controller [0280]: RaLink RT2561/RT61 802.11g PCI [1814:0301]
01:00.0 VGA compatible controller [0300]: VIA Technologies, Inc. UniChrome Pro
IGP [1106:3344] (rev 01)
# lspci -d 1106:3227 -xxx
00:11.0 ISA bridge: VIA Technologies, Inc. VT8237 ISA bridge
[KT600/K8T800/K8T890 South]
00: 06 11 27 32 87 00 10 02 00 00 01 06 00 00 80 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 06 11 08 aa
30: 00 00 00 00 c0 00 00 00 00 00 00 00 00 00 00 00
40: 44 00 f8 0b 00 00 00 00 0c 20 00 00 04 00 0a 08
50: 81 89 09 00 00 00 00 00 42 80 00 19 00 00 00 00
60: 80 00 00 00 00 00 04 04 80 00 d0 fe 00 00 00 00
70: 06 11 08 aa 00 00 00 00 00 00 00 00 20 00 00 00
80: 20 84 59 00 1a 30 00 00 01 04 00 00 0e 18 00 00
90: 70 2b 10 88 a0 c2 03 00 00 24 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 01 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 01 05 01 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 03 09 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 0b 00 00 00 00 00 00 00 00 00
# cat /proc/timer_list
[...]
Tick Device: mode: 1
Clock Event Device: hpet
max_delta_ns: 2147483647
min_delta_ns: 3352
mult: 61496110
shift: 32
mode: 3
next_event: 2223780000000 nsecs
set_next_event: hpet_legacy_next_event
set_mode: hpet_legacy_set_mode
event_handler: tick_handle_oneshot_broadcast
tick_broadcast_mask: 00000001
tick_broadcast_oneshot_mask: 00000000
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