From: Manfred Gruber <m.gruber@tirol.com>
To: linux-rt-users@vger.kernel.org
Subject: poison_obj latency
Date: Wed, 27 Jun 2007 12:51:57 +0200 [thread overview]
Message-ID: <200706271251.58092.m.gruber@tirol.com> (raw)
hi !
I use a arm4vt ep93xx processor with 2.6.21.5-rt18.
When i run cyclictest with -i 10000 and -n -p 90 -b 1000 i see some strange
latencies in poison_obj.
the output from /proc/latency_trace where the latency is shown:
OLD:cyclicte-884 0.... 13493us!: 5us: check_poison_obj+0x14/0x1bc
(cache_alloc_debugcheck_after+0x38/0x160)
ACT:cyclicte-884 0.... 13830us+: 336us: poison_obj+0x10/0x40
(cache_alloc_debugcheck_after+0x48/0x160)
NEW:cyclicte-884 0.... 13848us+: 18us: get_unused_fd+0x10/0xf4
(do_sys_open+0x3c/0xe8)
OLD:cyclicte-884 0.... 47181us!: 4us: check_poison_obj+0x14/0x1bc
(cache_alloc_debugcheck_after+0x38/0x160)
ACT:cyclicte-884 0.... 47514us+: 333us: poison_obj+0x10/0x40
(cache_alloc_debugcheck_after+0x48/0x160)
NEW:cyclicte-884 0.... 47533us+: 18us: get_unused_fd+0x10/0xf4
(do_sys_open+0x3c/0xe8)
OLD:cyclicte-884 0.... 90226us!: 5us: check_poison_obj+0x14/0x1bc
(cache_alloc_debugcheck_after+0x38/0x160)
ACT:cyclicte-884 0.... 90564us+: 338us: poison_obj+0x10/0x40
(cache_alloc_debugcheck_after+0x48/0x160)
NEW:cyclicte-884 0.... 90584us+: 19us: get_unused_fd+0x10/0xf4
(do_sys_open+0x3c/0xe8)
OLD:cyclicte-884 0.... 125182us!: 5us: check_poison_obj+0x14/0x1bc
(cache_alloc_debugcheck_after+0x38/0x160)
ACT:cyclicte-884 0.... 125520us+: 338us: poison_obj+0x10/0x40
(cache_alloc_debugcheck_after+0x48/0x160)
NEW:cyclicte-884 0.... 125540us+: 19us: get_unused_fd+0x10/0xf4
(do_sys_open+0x3c/0xe8)
OLD:cyclicte-884 0.... 157308us!: 5us: check_poison_obj+0x14/0x1bc
(cache_alloc_debugcheck_after+0x38/0x160)
ACT:cyclicte-884 0.... 157644us+: 335us: poison_obj+0x10/0x40
(cache_alloc_debugcheck_after+0x48/0x160)
NEW:cyclicte-884 0.... 157661us+: 17us: get_unused_fd+0x10/0xf4
(do_sys_open+0x3c/0xe8)
OLD:cyclicte-884 0D..1 193339us!: 5us:
trace_stop_sched_switched+0x14/0x374 (__schedule+0x478/0x5a4)
ACT:cyclicte-884 0.... 193662us+: 323us: poison_obj+0x10/0x40
(cache_alloc_debugcheck_after+0x48/0x160)
NEW:cyclicte-884 0.... 193683us+: 21us: get_unused_fd+0x10/0xf4
(do_sys_open+0x3c/0xe8)
OLD:cyclicte-884 0.... 226083us!: 5us: check_poison_obj+0x14/0x1bc
(cache_alloc_debugcheck_after+0x38/0x160)
ACT:cyclicte-884 0.... 226419us+: 335us: poison_obj+0x10/0x40
(cache_alloc_debugcheck_after+0x48/0x160)
NEW:cyclicte-884 0.... 226438us+: 19us: get_unused_fd+0x10/0xf4
(do_sys_open+0x3c/0xe8)
OLD:cyclicte-884 0.... 258101us!: 5us: check_poison_obj+0x14/0x1bc
(cache_alloc_debugcheck_after+0x38/0x160)
ACT:cyclicte-884 0.... 258438us+: 336us: poison_obj+0x10/0x40
(cache_alloc_debugcheck_after+0x48/0x160)
NEW:cyclicte-884 0.... 258456us+: 18us: get_unused_fd+0x10/0xf4
(do_sys_open+0x3c/0xe8)
OLD:cyclicte-884 0.... 290710us!: 5us: check_poison_obj+0x14/0x1bc
(cache_alloc_debugcheck_after+0x38/0x160)
ACT:cyclicte-884 0.... 291047us+: 336us: poison_obj+0x10/0x40
(cache_alloc_debugcheck_after+0x48/0x160)
NEW:cyclicte-884 0.... 291063us+: 16us: get_unused_fd+0x10/0xf4
(do_sys_open+0x3c/0xe8)
OLD:cyclicte-884 0.... 327645us!: 5us: check_poison_obj+0x14/0x1bc
(cache_alloc_debugcheck_after+0x38/0x160)
ACT:cyclicte-884 0.... 327982us+: 336us: poison_obj+0x10/0x40
(cache_alloc_debugcheck_after+0x48/0x160)
NEW:cyclicte-884 0.... 328002us+: 20us: get_unused_fd+0x10/0xf4
(do_sys_open+0x3c/0xe8)
does someone have an idea where this comes from ?
the hole /proc/latency output is shown here:
https://dev.contec.at/micro9/tmp/l_t.txt
--
regards
Manfred Gruber
next reply other threads:[~2007-06-27 10:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-27 10:51 Manfred Gruber [this message]
2007-06-27 12:34 ` poison_obj latency Ingo Molnar
2007-06-27 13:24 ` Manfred Gruber
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