Hello All,
Increasing the number of buffers and buffer size did helped indeed. Thanks to
both for the advice.
Another question is, what is the maximum --subbuf-size & --num-subbuf one can
go? I guess it should depend upon your memory size?
I am asking this because I had trouble last time, where my system crashed with
some "general protection fault" while I had --subbuf-size of 2^29 . Attached
are the syslog messages.
Regards,
S.
--
Salman Rafiq
Industrial Communication
Fraunhofer-Einrichtung für Systeme der Kommunikationstechnik ESK
Hansastraße 32 | 80686 München
Telefon, Fax: +49 89 547088-356 | +49 89 547088-66-356
E-Mail: [email protected]
Internet:
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-----Ursprüngliche Nachricht-----
Von: Mathieu Desnoyers [mailto:[email protected]]
Gesendet: Monday, April 16, 2012 4:33 PM
An: Oestman, Fredrik
Cc: [email protected]; Salman Rafiq
Betreff: Re: [lttng-dev] Babeltrace Buffer Warning
* Oestman, Fredrik ([email protected]) wrote:
> Mathieu Desnoyers wrote:
> > The warning message is:
> >
> > "[warning] Tracer discarded 280625 events between
> > [1334315833.578351009] and [1334315833.578351380]. You should
> > consider increasing the buffer size."
> >
> > which states that the tracer did discard the events (not the
> > converter).
> > But maybe I'm missing your point. What would you recommend to make
> > this message clearer ?
>
> I actually had no recommendation or suggestion in mind. To me the message is
> clear. I just got the impression that the OP may have been confused in this
> respect for some reason.
>
> But since you ask, what about something along the lines of:
>
> "[warning] The tracer discarded 280625 events between
> [1334315833.578351009] and [1334315833.578351380]. You should consider
> making a new trace with larger buffers or with fewer event types enabled."
Good idea. Fixed in commit:
commit a0b34fbba498a8a447357adf5920ac2c8a22f026
Author: Mathieu Desnoyers <[email protected]>
Date: Mon Apr 16 10:33:55 2012 -0400
Clarify warning message for events discarded
Reported-by: Fredrik Oestman <[email protected]>
Signed-off-by: Mathieu Desnoyers <[email protected]>
Thanks!
Mathieu
>
>
> Cheers,
>
> Fredrik Östman
>
--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant EfficiOS Inc.
http://www.efficios.com
Message from syslogd@oje at Apr 16 17:29:27 ...
kernel:[2777781.860828] general protection fault: 0000 [#1] SMP
Message from syslogd@oje at Apr 16 17:29:27 ...
kernel:[2777781.864740] Stack:
Message from syslogd@oje at Apr 16 17:29:27 ...
kernel:[2777781.864740] Call Trace:
Message from syslogd@oje at Apr 16 17:29:27 ...
kernel:[2777781.864740] Code: 48 8b 7b 08 48 89 c5 48 8d 43 08 48 39 c7 75 05
ff 43 04 eb 05 e8 10 e1 27 00 48 89 df 48 89 ee 5b 5b 5d e9 b5 e6 27 00 90 eb
0c <8b> 50 10 39 56 10 7f 0c 48 8d 78 08 48 8b 07 48 85 c0 75 ec 48
Apr 16 17:29:27 oje kernel: [2777781.864435] CPU 4
Apr 16 17:29:27 oje kernel: [2777781.864466] Modules linked in:
lttng_probe_timer(O) lttng_probe_statedump(O) lttng_probe_signal(O)
lttng_probe_sched(O) lttng_probe_kvm(O) lttng_probe_irq(O) lttng_probe_block(O)
lttng_types(O) lttng_probe_lttng(O) lttng_ring_buffer_metadata_mmap_client(O)
lttng_ring_buffer_client_mmap_overwrite(O)
lttng_ring_buffer_client_mmap_discard(O) lttng_ring_buffer_metadata_client(O)
lttng_ring_buffer_client_overwrite(O) lttng_ring_buffer_client_discard(O)
lttng_tracer(O) lttng_kretprobes(O) lttng_kprobes(O) lttng_statedump(O)
lttng_lib_ring_buffer(O) bnep rfcomm bluetooth rfkill crc16 parport_pc ppdev lp
parport binfmt_misc fuse nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc loop
radeon joydev ttm drm_kms_helper drm edac_core shpchp nv_tco psmouse
i2c_nforce2 i2c_algo_bit power_supply pci_hotplug pcspkr edac_mce_amd i2c_core
evdev k10temp serio_raw ext3 jbd mbcache sg sr_mod sd_mod cdrom crc_t10dif
usbhid hid ata_generic pata_amd ohci_hcd sata_nv libata ehci_hcd igb e1000
scsi_mod
Apr 16 17:29:27 oje kernel: usbcore dca [last unloaded: lttng_kretprobes]
Apr 16 17:29:27 oje kernel: [2777781.864740]
Apr 16 17:29:27 oje kernel: [2777781.864740] Pid: 5746, comm: lttng-sessiond
Tainted: G W O 3.0.0opteron #4 Supermicro H8QM3/H8QM3
Apr 16 17:29:27 oje kernel: [2777781.864740] RIP: 0010:[<ffffffff8105ac32>]
[<ffffffff8105ac32>] notifier_chain_register+0x2/0x20
Apr 16 17:29:27 oje kernel: [2777781.864740] RSP: 0018:ffff880077083bc0
EFLAGS: 00010282
Apr 16 17:29:27 oje kernel: [2777781.864740] RAX: a8c00e1ea8c0f2e6 RBX:
ffff8800bb113c50 RCX: 0000000000000010
Apr 16 17:29:27 oje kernel: [2777781.864740] RDX: 0000000001082e40 RSI:
ffff8800bb113c50 RDI: ffff880030ffb858
Apr 16 17:29:27 oje kernel: [2777781.864740] RBP: ffffffffa03b5270 R08:
0000000000000200 R09: ffffffff8167eff0
Apr 16 17:29:27 oje kernel: [2777781.864740] R10: 00000000000000c2 R11:
00000000000000c2 R12: 00000000ffffffff
Apr 16 17:29:27 oje kernel: [2777781.864740] R13: ffff8801273fbc80 R14:
0000000010000000 R15: 0000000000000010
Apr 16 17:29:27 oje kernel: [2777781.864740] FS: 00007f7bd96a9700(0000)
GS:ffff88012fc00000(0000) knlGS:0000000000000000
Apr 16 17:29:27 oje kernel: [2777781.864740] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Apr 16 17:29:27 oje kernel: [2777781.864740] CR2: 00000000023332b0 CR3:
000000012d04b000 CR4: 00000000000006e0
Apr 16 17:29:27 oje kernel: [2777781.864740] DR0: 0000000000000000 DR1:
0000000000000000 DR2: 0000000000000000
Apr 16 17:29:27 oje kernel: [2777781.864740] DR3: 0000000000000000 DR6:
00000000ffff0ff0 DR7: 0000000000000400
Apr 16 17:29:27 oje kernel: [2777781.864740] Process lttng-sessiond (pid: 5746,
threadinfo ffff880077082000, task ffff8800772dc770)
Apr 16 17:29:27 oje kernel: [2777781.864740] ffffffff812c0ee0 ffff8801273fbc80
0000000010000000 ffff8800bb113c10
Apr 16 17:29:27 oje kernel: [2777781.864740] ffffffffa03a00e3 0000000000000246
0000001010000000 ffff8801273fbc80
Apr 16 17:29:27 oje kernel: [2777781.864740] ffff8800bb113c00 ffffffffa03b5270
ffffffffa0411188 ffff8800bb113c10
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffff812c0ee0>] ?
register_cpu_notifier+0x1c/0x2f
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffffa03a00e3>] ?
channel_backend_init+0x189/0x2a0 [lttng_lib_ring_buffer]
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffffa03a06ac>] ?
channel_create+0x76/0x1ce [lttng_lib_ring_buffer]
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffffa03b44ac>] ?
_channel_create+0x2b/0x30 [lttng_ring_buffer_client_discard]
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffffa03ce622>] ?
lttng_channel_create+0xeb/0x165 [lttng_tracer]
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffffa03cf734>] ?
lttng_abi_create_channel+0x122/0x1c5 [lttng_tracer]
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffff810c7172>] ?
page_move_anon_rmap+0x1c/0x28
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffffa03cfbdd>] ?
lttng_session_ioctl+0x64/0x71 [lttng_tracer]
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffff810f4455>] ?
do_vfs_ioctl+0x45c/0x49d
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffff810f71d8>] ?
dput+0xd8/0xe4
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffff810fbd02>] ?
cpumask_next+0x16/0x18
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffff810fcc74>] ?
mnt_get_count+0x32/0x41
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffff810f44e1>] ?
sys_ioctl+0x4b/0x72
Apr 16 17:29:27 oje kernel: [2777781.864740] [<ffffffff812de292>] ?
system_call_fastpath+0x16/0x1b
Apr 16 17:29:27 oje kernel: [2777781.864740] RSP <ffff880077083bc0>
Apr 16 17:29:27 oje kernel: [2777782.091016] ---[ end trace fcc54233a1dc458e
]---
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