From: Elias Oltmanns <eo@nebensachen.de>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Jiri Slaby <jirislaby@gmail.com>, linux-wireless@vger.kernel.org
Subject: Re: ath5k: kernel timing screwed - due to unserialised register access?
Date: Wed, 15 Oct 2008 00:01:03 +0200 [thread overview]
Message-ID: <87skqyj0ps.fsf@denkblock.local> (raw)
In-Reply-To: alpine.LFD.2.00.0810142054580.6848@apollo
Thomas Gleixner <tglx@linutronix.de> wrote:
> On Sat, 11 Oct 2008, Elias Oltmanns wrote:
>> > Compile the acpi_processor module in to the kernel
>
>> > (CONFIG_ACPI_PROCESSOR=y) and add processor.max_cstate=1 to the kernel
>> > command line. If I analysed the problem correctly this will make the
>> > jiffies problem go away. I'm working on a fix.
>>
>> Spot on, it does go away regardless whether NO_HZ or HIGH_RES are
>> enabled or disabled. Looking forward to testing your fix ;-).
>
> Here you go.
Bad luck, I'm afraid. Your patch seems to fix the issue for NO_HZ=n +
HIGH_RES=y. As soon as NO_HZ=y, however, the problem reappears. See the
output below. (Still testing on 2.6.27, mind. Should I test something
more up-to-date?)
Regards,
Elias
--8<---------------dmesg---------------start------------->8---
Oct 14 22:44:25 denkblock kernel: [ 150.063028] b: 150.062655731 n: 150.063022258 e: 4294952302 j: 4294952302
Oct 14 22:44:25 denkblock kernel: [ 150.063035] Timer List Version: v0.3
Oct 14 22:44:25 denkblock kernel: [ 150.063038] HRTIMER_MAX_CLOCK_BASES: 2
Oct 14 22:44:25 denkblock kernel: [ 150.063041] now at 150063035109 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063043]
Oct 14 22:44:25 denkblock kernel: [ 150.063045] cpu: 0
Oct 14 22:44:25 denkblock kernel: [ 150.063047] clock 0:
Oct 14 22:44:25 denkblock kernel: [ 150.063048] .index: 0
Oct 14 22:44:25 denkblock kernel: [ 150.063051] .resolution: 10000000 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063053] .get_time: ktime_get_real
Oct 14 22:44:25 denkblock kernel: [ 150.063062] active timers:
Oct 14 22:44:25 denkblock kernel: [ 150.063064] clock 1:
Oct 14 22:44:25 denkblock kernel: [ 150.063066] .index: 1
Oct 14 22:44:25 denkblock kernel: [ 150.063068] .resolution: 10000000 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063070] .get_time: ktime_get
Oct 14 22:44:25 denkblock kernel: [ 150.063074] active timers:
Oct 14 22:44:25 denkblock kernel: [ 150.063076] #0: <c02e2f14>, hrtimer_wakeup, S:01, do_nanosleep, tail/2440
Oct 14 22:44:25 denkblock kernel: [ 150.063098] # expires at 150440037040 nsecs [in 377001931 nsecs]
Oct 14 22:44:25 denkblock kernel: [ 150.063102] #1: <c02e2f14>, it_real_fn, S:01, do_setitimer, syslogd/2343
Oct 14 22:44:25 denkblock kernel: [ 150.063115] # expires at 173530381509 nsecs [in 23467346400 nsecs]
Oct 14 22:44:25 denkblock kernel: [ 150.063119] .nohz_mode : 1
Oct 14 22:44:25 denkblock kernel: [ 150.063121] .idle_tick : 150030000000 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063124] .tick_stopped : 0
Oct 14 22:44:25 denkblock kernel: [ 150.063126] .idle_jiffies : 4294952299
Oct 14 22:44:25 denkblock kernel: [ 150.063129] .idle_calls : 21431
Oct 14 22:44:25 denkblock kernel: [ 150.063132] .idle_sleeps : 16504
Oct 14 22:44:25 denkblock kernel: [ 150.063134] .idle_entrytime : 150063016112 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063137] .idle_waketime : 150040009551 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063140] .idle_exittime : 150062664671 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063143] .idle_sleeptime : 138813566362 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063146] .last_jiffies : 4294952302
Oct 14 22:44:25 denkblock kernel: [ 150.063148] .next_jiffies : 4294952302
Oct 14 22:44:25 denkblock kernel: [ 150.063151] .idle_expires : 150040000000 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063154] .last_events0 : 150010011037 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063157] .last_events1 : 150020010914 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063159] .last_events2 : 150040012344 nsecs
Oct 14 22:44:25 denkblock kernel: [ 150.063162] jiffies: 4294952302
Oct 14 22:44:25 denkblock kernel: [ 150.063164]
Oct 14 22:44:25 denkblock kernel: [ 150.063165]
Oct 14 22:44:25 denkblock kernel: [ 150.063167] Tick Device: mode: 1
Oct 14 22:44:25 denkblock kernel: [ 150.063169] Clock Event Device: pit
Oct 14 22:44:26 denkblock kernel: [ 150.063172] max_delta_ns: 27461866
Oct 14 22:44:26 denkblock kernel: [ 150.063175] min_delta_ns: 12571
Oct 14 22:44:26 denkblock kernel: [ 150.063177] mult: 5124677
Oct 14 22:44:26 denkblock kernel: [ 150.063179] shift: 32
Oct 14 22:44:26 denkblock kernel: [ 150.063181] mode: 3
Oct 14 22:44:26 denkblock kernel: [ 150.063184] next_event: 9223372036854775807 nsecs
Oct 14 22:44:26 denkblock kernel: [ 150.063187] set_next_event: pit_next_event
Oct 14 22:44:26 denkblock kernel: [ 150.063193] set_mode: init_pit_timer
Oct 14 22:44:26 denkblock kernel: [ 150.063197] event_handler: tick_handle_oneshot_broadcast
Oct 14 22:44:26 denkblock kernel: [ 150.063203] tick_broadcast_mask: 00000001
Oct 14 22:44:26 denkblock kernel: [ 150.063205] tick_broadcast_oneshot_mask: 00000000
Oct 14 22:44:26 denkblock kernel: [ 150.063208]
Oct 14 22:44:26 denkblock kernel: [ 150.063209]
Oct 14 22:44:26 denkblock kernel: [ 150.063211] Tick Device: mode: 1
Oct 14 22:44:26 denkblock kernel: [ 150.063213] Clock Event Device: lapic
Oct 14 22:44:26 denkblock kernel: [ 150.063216] max_delta_ns: 1346509690
Oct 14 22:44:26 denkblock kernel: [ 150.063218] min_delta_ns: 2407
Oct 14 22:44:26 denkblock kernel: [ 150.063221] mult: 26757173
Oct 14 22:44:26 denkblock kernel: [ 150.063223] shift: 32
Oct 14 22:44:26 denkblock kernel: [ 150.063225] mode: 3
Oct 14 22:44:26 denkblock kernel: [ 150.063227] next_event: 150070000000 nsecs
Oct 14 22:44:26 denkblock kernel: [ 150.063230] set_next_event: lapic_next_event
Oct 14 22:44:26 denkblock kernel: [ 150.063234] set_mode: lapic_timer_setup
Oct 14 22:44:26 denkblock kernel: [ 150.063237] event_handler: tick_nohz_handler
Oct 14 22:44:26 denkblock kernel: [ 150.063241]
--8<---------------dmesg---------------end--------------->8---
next prev parent reply other threads:[~2008-10-14 22:07 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-05 21:45 ath5k: kernel timing screwed - due to unserialised register access? Elias Oltmanns
2008-10-05 21:59 ` Thomas Gleixner
2008-10-06 14:04 ` Elias Oltmanns
2008-10-06 19:47 ` Thomas Gleixner
2008-10-07 15:27 ` Elias Oltmanns
2008-10-07 18:02 ` Thomas Gleixner
2008-10-07 18:44 ` Thomas Gleixner
2008-10-07 21:23 ` Elias Oltmanns
2008-10-08 11:39 ` Elias Oltmanns
2008-10-08 21:14 ` Thomas Gleixner
2008-10-09 11:15 ` Thomas Gleixner
2008-10-10 8:33 ` Elias Oltmanns
2008-10-10 10:13 ` Thomas Gleixner
2008-10-10 11:50 ` Elias Oltmanns
2008-10-10 12:34 ` Thomas Gleixner
2008-10-10 12:59 ` Elias Oltmanns
2008-10-10 21:32 ` Christoph Hellwig
2008-10-11 9:55 ` Thomas Gleixner
2008-10-10 19:24 ` Nick Kossifidis
2008-10-11 9:54 ` Thomas Gleixner
2008-10-11 20:30 ` Elias Oltmanns
2008-10-14 19:00 ` Thomas Gleixner
2008-10-14 22:01 ` Elias Oltmanns [this message]
2008-10-15 8:43 ` Thomas Gleixner
2008-10-15 16:32 ` Elias Oltmanns
2008-10-15 19:53 ` Thomas Gleixner
2008-10-17 21:03 ` Elias Oltmanns
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