Date: Wed, 11 Sep 2013 21:59:18 -0700 From: hiren panchasara <hiren.panchasara@gmail.com> To: freebsd-current <freebsd-current@freebsd.org> Subject: Re: Intermittent hangs in vmem_periodic() Message-ID: <CALCpEUFFrDvwjqOrJhZzKzpT6Hmn6mm4KsH-LBdHw-AUDgrauQ@mail.gmail.com> In-Reply-To: <CALCpEUGherrJbmW9PBO7kSQk1Gj4zigGvvsRiyAwjk-USOXTUw@mail.gmail.com> References: <CALCpEUGherrJbmW9PBO7kSQk1Gj4zigGvvsRiyAwjk-USOXTUw@mail.gmail.com>
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On Wed, Sep 11, 2013 at 9:51 PM, hiren panchasara <
hiren.panchasara@gmail.com> wrote:
> I am seeing really weird system freeze for 2-3 seconds every minute or so.
>
> % uname -a
> FreeBSD flymockour-l7.corp.yahoo.com 10.0-CURRENT FreeBSD 10.0-CURRENT #2
> r255423M: Mon Sep 9 12:29:22 PDT 2013 root@flymocko
> ur-l7.corp.yahoo.com:/usr/obj/usr/home/hirenp/head/sys/GENERIC amd64
>
> Simple comands like "man top" hangs and this is what I see in ctrl+T
> % man top
> load: 1.59 cmd: zcat 76574 [*kmem arena] 2.16r 0.00u 1.82s 16% 2000k
> load: 1.70 cmd: zcat 76574 [*kmem arena] 7.19r 0.00u 1.82s 7% 2000k
> load: 1.89 cmd: zcat 76574 [*kmem arena] 12.58r 0.00u 1.82s 3% 2000k
> load: 1.90 cmd: zcat 76574 [*kmem arena] 14.58r 0.00u 1.82s 2% 2000k
>
> I see similar things while trying to "exit" a terminal window.
>
> I see following in pmcstat:
>
> PMC: [INSTR_RETIRED_ANY] Samples: 117647 (100.0%) , 6885 unresolved
>
> %SAMP CALLTREE
> 75.9 fork_exit@kernel taskqueue_thread_loop taskqueue_run_locked
> vmem_periodic(75.9%)
>
At any point in time whether system is misbehaving or not, I see this on
top of the graph. Which seems wrong.
Providing a few samples over the time:
PMC: [INSTR_RETIRED_ANY] Samples: 97253 (100.0%) , 6080 unresolved
%SAMP CALLTREE
78.1 fork_exit@kernel taskqueue_thread_loop taskqueue_run_locked
vmem_periodic(78.1%)
1.0 bsearch@libc.so.7(1.0%)
0.7 0xe7b661@libnvidia-glcore.s clock_gettime@libc.so.7 0x128c6e
0x128a80(0.6%)
0.2 amd64_syscall@kernel sys_select kern_select
0.2 lapic_handle_timer@kernel timercb handleevents hardclock_cnt
pmc_hook_handler@hwpmc.ko pmc_process_samples
0.0 amd64_syscall@kernel sys_poll
0.0 free@libc.so.7
0.0 0x212ff56@libxul.so 0x2130835 0x212f907 0x212f1e7 0x212d2fa 0x22b6777
0x22b6478
PMC: [INSTR_RETIRED_ANY] Samples: 35320 (100.0%) , 3663 unresolved
%SAMP CALLTREE
32.4 fork_exit@kernel taskqueue_thread_loop taskqueue_run_locked
vmem_periodic(32.4%)
1.6 free@libc.so.7 0x9ad75 0x9a597(1.4%)
1.3 intr_event_execute_handlers@kernel hdac_intr_handler hdaa_stream_intr
chn_intr chn_intr_locked sndbuf_feed
feed_mixer_feed z_resampler_feed z_feed_linear_S16LE(1.0%)
1.3 hdac_intr_handler@kernel hdaa_stream_intr chn_intr chn_intr_locked
sndbuf_feed feed_mixer_feed z_resampler_feed
z_feed_linear_S16LE(1.0%)
1.2 amd64_syscall@kernel sys___sysctl userland_sysctl sysctl_root
cpufreq_curr_sysctl cf_set_method est_set DELAY(0.6%)
get_tsc(0.5%)
1.1 bsearch@libc.so.7(1.1%)
PMC: [INSTR_RETIRED_ANY] Samples: 118799 (100.0%) , 7859 unresolved
%SAMP CALLTREE
70.5 fork_exit@kernel taskqueue_thread_loop taskqueue_run_locked
vmem_periodic(70.5%)
1.1 bsearch@libc.so.7(1.1%)
0.2 lapic_handle_timer@kernel timercb handleevents hardclock_cnt
pmc_hook_handler@hwpmc.ko pmc_process_samples
0.1 free@libc.so.7
0.1 0xe7b661@libnvidia-glcore.s clock_gettime@libc.so.7
0.1 amd64_syscall@kernel sys_select kern_select
0.1 __realloc@libc.so.7
0.1 amd64_syscall@kernel sys_poll
cheers,
Hiren
>
> I am not running anything funny and I do not see anything weird in "top"
> too.
>
> Any help is appreciated.
>
> cheers,
> Hiren
>
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