* [RFC][PATCH] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET is in progress
@ 2018-07-03 19:36 ` John Stultz
0 siblings, 0 replies; 6+ messages in thread
From: john.stultz @ 2018-07-03 19:36 UTC (permalink / raw)
In the past we've warned when ADJ_OFFSET was in progress, usually
caused by ntpd or some other time adjusting daemon running in non
steady sate, which can cause the skew calculations to be incorrect
Thus, this patch sets a flag which we check when we fail so that
we don't cause false negatives.
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Ingo Molnar <mingo at kernel.org>
Cc: Miroslav Lichvar <mlichvar at redhat.com>
Cc: Richard Cochran <richardcochran at gmail.com>
Cc: Prarit Bhargava <prarit at redhat.com>
Cc: Stephen Boyd <sboyd at kernel.org>
Cc: Shuah Khan <shuah at kernel.org>
Cc: linux-kselftest at vger.kernel.org
Suggested-by: Miroslav Lichvar <mlichvar at redhat.com>
Signed-off-by: John Stultz <john.stultz at linaro.org>
---
tools/testing/selftests/timers/raw_skew.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index ca6cd14..d3fc453 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -94,6 +94,7 @@ int main(int argv, char **argc)
struct timespec mon, raw, start, end;
long long delta1, delta2, interval, eppm, ppm;
struct timex tx1, tx2;
+ int adj_offset_bad = 0;
setbuf(stdout, NULL);
@@ -108,8 +109,10 @@ int main(int argv, char **argc)
start = mon;
delta1 = diff_timespec(mon, raw);
- if (tx1.offset)
+ if (tx1.offset) {
printf("WARNING: ADJ_OFFSET in progress, this will cause inaccurate results\n");
+ adj_offset_bad = 1;
+ }
printf("Estimating clock drift: ");
sleep(120);
@@ -134,6 +137,10 @@ int main(int argv, char **argc)
printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
if (llabs(eppm - ppm) > 1000) {
+ if (adj_offset_bad) {
+ printf(" [SKIP]\n");
+ return ksft_exit_skip("ADJ_OFFSET in progress. Shutdown NTPd or other time steering daemons\n");
+ }
printf(" [FAILED]\n");
return ksft_exit_fail();
}
--
2.7.4
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^ permalink raw reply related [flat|nested] 6+ messages in thread* [RFC][PATCH] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET is in progress
@ 2018-07-03 19:36 ` John Stultz
0 siblings, 0 replies; 6+ messages in thread
From: John Stultz @ 2018-07-03 19:36 UTC (permalink / raw)
To: lkml
Cc: John Stultz, Thomas Gleixner, Ingo Molnar, Miroslav Lichvar,
Richard Cochran, Prarit Bhargava, Stephen Boyd, Shuah Khan,
linux-kselftest
In the past we've warned when ADJ_OFFSET was in progress, usually
caused by ntpd or some other time adjusting daemon running in non
steady sate, which can cause the skew calculations to be incorrect
Thus, this patch sets a flag which we check when we fail so that
we don't cause false negatives.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: linux-kselftest@vger.kernel.org
Suggested-by: Miroslav Lichvar <mlichvar@redhat.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
tools/testing/selftests/timers/raw_skew.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index ca6cd14..d3fc453 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -94,6 +94,7 @@ int main(int argv, char **argc)
struct timespec mon, raw, start, end;
long long delta1, delta2, interval, eppm, ppm;
struct timex tx1, tx2;
+ int adj_offset_bad = 0;
setbuf(stdout, NULL);
@@ -108,8 +109,10 @@ int main(int argv, char **argc)
start = mon;
delta1 = diff_timespec(mon, raw);
- if (tx1.offset)
+ if (tx1.offset) {
printf("WARNING: ADJ_OFFSET in progress, this will cause inaccurate results\n");
+ adj_offset_bad = 1;
+ }
printf("Estimating clock drift: ");
sleep(120);
@@ -134,6 +137,10 @@ int main(int argv, char **argc)
printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
if (llabs(eppm - ppm) > 1000) {
+ if (adj_offset_bad) {
+ printf(" [SKIP]\n");
+ return ksft_exit_skip("ADJ_OFFSET in progress. Shutdown NTPd or other time steering daemons\n");
+ }
printf(" [FAILED]\n");
return ksft_exit_fail();
}
--
2.7.4
^ permalink raw reply related [flat|nested] 6+ messages in thread* [RFC][PATCH] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET is in progress
@ 2018-07-03 19:36 ` John Stultz
0 siblings, 0 replies; 6+ messages in thread
From: John Stultz @ 2018-07-03 19:36 UTC (permalink / raw)
In the past we've warned when ADJ_OFFSET was in progress, usually
caused by ntpd or some other time adjusting daemon running in non
steady sate, which can cause the skew calculations to be incorrect
Thus, this patch sets a flag which we check when we fail so that
we don't cause false negatives.
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Ingo Molnar <mingo at kernel.org>
Cc: Miroslav Lichvar <mlichvar at redhat.com>
Cc: Richard Cochran <richardcochran at gmail.com>
Cc: Prarit Bhargava <prarit at redhat.com>
Cc: Stephen Boyd <sboyd at kernel.org>
Cc: Shuah Khan <shuah at kernel.org>
Cc: linux-kselftest at vger.kernel.org
Suggested-by: Miroslav Lichvar <mlichvar at redhat.com>
Signed-off-by: John Stultz <john.stultz at linaro.org>
---
tools/testing/selftests/timers/raw_skew.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/timers/raw_skew.c b/tools/testing/selftests/timers/raw_skew.c
index ca6cd14..d3fc453 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -94,6 +94,7 @@ int main(int argv, char **argc)
struct timespec mon, raw, start, end;
long long delta1, delta2, interval, eppm, ppm;
struct timex tx1, tx2;
+ int adj_offset_bad = 0;
setbuf(stdout, NULL);
@@ -108,8 +109,10 @@ int main(int argv, char **argc)
start = mon;
delta1 = diff_timespec(mon, raw);
- if (tx1.offset)
+ if (tx1.offset) {
printf("WARNING: ADJ_OFFSET in progress, this will cause inaccurate results\n");
+ adj_offset_bad = 1;
+ }
printf("Estimating clock drift: ");
sleep(120);
@@ -134,6 +137,10 @@ int main(int argv, char **argc)
printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
if (llabs(eppm - ppm) > 1000) {
+ if (adj_offset_bad) {
+ printf(" [SKIP]\n");
+ return ksft_exit_skip("ADJ_OFFSET in progress. Shutdown NTPd or other time steering daemons\n");
+ }
printf(" [FAILED]\n");
return ksft_exit_fail();
}
--
2.7.4
--
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^ permalink raw reply related [flat|nested] 6+ messages in thread* [RFC][PATCH] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET is in progress
@ 2018-07-04 7:49 ` Miroslav Lichvar
0 siblings, 0 replies; 6+ messages in thread
From: mlichvar @ 2018-07-04 7:49 UTC (permalink / raw)
On Tue, Jul 03, 2018 at 12:36:27PM -0700, John Stultz wrote:
> In the past we've warned when ADJ_OFFSET was in progress, usually
> caused by ntpd or some other time adjusting daemon running in non
> steady sate, which can cause the skew calculations to be incorrect
Good idea.
> Thus, this patch sets a flag which we check when we fail so that
> we don't cause false negatives.
I'd suggest to check few more things to better detect when something
is adjusting the clock. The offset should be zero also at the end of
the test and the frequency and tick should be the same as at the
beginning of the test. This will detect daemons that set the frequency
of the clock directly, not using adjtime() or the PLL.
Something like this:
@@ -137,9 +135,10 @@ int main(int argv, char **argc)
printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
if (llabs(eppm - ppm) > 1000) {
- if (adj_offset_bad) {
+ if (tx1.offset || tx2.offset ||
+ tx1.freq != tx2.freq || tx1.tick != tx2.tick) {
printf(" [SKIP]\n");
- return ksft_exit_skip("ADJ_OFFSET in progress. Shutdown NTPd or other time steering daemons\n");
+ return ksft_exit_skip("The clock was adjusted. Shutdown ntpd or other time steering daemons\n");
}
printf(" [FAILED]\n");
return ksft_exit_fail();
--
Miroslav Lichvar
--
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^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [RFC][PATCH] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET is in progress
@ 2018-07-04 7:49 ` Miroslav Lichvar
0 siblings, 0 replies; 6+ messages in thread
From: Miroslav Lichvar @ 2018-07-04 7:49 UTC (permalink / raw)
To: John Stultz
Cc: lkml, Thomas Gleixner, Ingo Molnar, Richard Cochran,
Prarit Bhargava, Stephen Boyd, Shuah Khan, linux-kselftest
On Tue, Jul 03, 2018 at 12:36:27PM -0700, John Stultz wrote:
> In the past we've warned when ADJ_OFFSET was in progress, usually
> caused by ntpd or some other time adjusting daemon running in non
> steady sate, which can cause the skew calculations to be incorrect
Good idea.
> Thus, this patch sets a flag which we check when we fail so that
> we don't cause false negatives.
I'd suggest to check few more things to better detect when something
is adjusting the clock. The offset should be zero also at the end of
the test and the frequency and tick should be the same as at the
beginning of the test. This will detect daemons that set the frequency
of the clock directly, not using adjtime() or the PLL.
Something like this:
@@ -137,9 +135,10 @@ int main(int argv, char **argc)
printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
if (llabs(eppm - ppm) > 1000) {
- if (adj_offset_bad) {
+ if (tx1.offset || tx2.offset ||
+ tx1.freq != tx2.freq || tx1.tick != tx2.tick) {
printf(" [SKIP]\n");
- return ksft_exit_skip("ADJ_OFFSET in progress. Shutdown NTPd or other time steering daemons\n");
+ return ksft_exit_skip("The clock was adjusted. Shutdown ntpd or other time steering daemons\n");
}
printf(" [FAILED]\n");
return ksft_exit_fail();
--
Miroslav Lichvar
^ permalink raw reply [flat|nested] 6+ messages in thread* [RFC][PATCH] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET is in progress
@ 2018-07-04 7:49 ` Miroslav Lichvar
0 siblings, 0 replies; 6+ messages in thread
From: Miroslav Lichvar @ 2018-07-04 7:49 UTC (permalink / raw)
On Tue, Jul 03, 2018@12:36:27PM -0700, John Stultz wrote:
> In the past we've warned when ADJ_OFFSET was in progress, usually
> caused by ntpd or some other time adjusting daemon running in non
> steady sate, which can cause the skew calculations to be incorrect
Good idea.
> Thus, this patch sets a flag which we check when we fail so that
> we don't cause false negatives.
I'd suggest to check few more things to better detect when something
is adjusting the clock. The offset should be zero also at the end of
the test and the frequency and tick should be the same as at the
beginning of the test. This will detect daemons that set the frequency
of the clock directly, not using adjtime() or the PLL.
Something like this:
@@ -137,9 +135,10 @@ int main(int argv, char **argc)
printf(" %lld.%i(act)", ppm/1000, abs((int)(ppm%1000)));
if (llabs(eppm - ppm) > 1000) {
- if (adj_offset_bad) {
+ if (tx1.offset || tx2.offset ||
+ tx1.freq != tx2.freq || tx1.tick != tx2.tick) {
printf(" [SKIP]\n");
- return ksft_exit_skip("ADJ_OFFSET in progress. Shutdown NTPd or other time steering daemons\n");
+ return ksft_exit_skip("The clock was adjusted. Shutdown ntpd or other time steering daemons\n");
}
printf(" [FAILED]\n");
return ksft_exit_fail();
--
Miroslav Lichvar
--
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the body of a message to majordomo at vger.kernel.org
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2018-07-04 7:49 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2018-07-03 19:36 [RFC][PATCH] selftest: timers: Tweak raw_skew to SKIP when ADJ_OFFSET is in progress john.stultz
2018-07-03 19:36 ` John Stultz
2018-07-03 19:36 ` John Stultz
2018-07-04 7:49 ` mlichvar
2018-07-04 7:49 ` Miroslav Lichvar
2018-07-04 7:49 ` Miroslav Lichvar
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