From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] do_gettimeofday() fails to compensate for lost ticks
Date: Wed, 24 Sep 2003 18:02:21 +0000 [thread overview]
Message-ID: <marc-linux-ia64-106442674331918@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-106442430128845@msgid-missing>
>>>>> On Wed, 24 Sep 2003 11:21:19 -0600 (MDT), Khalid Aziz <khalid@fc.hp.com> said:
Khalid> do_gettimeofday() needs to account for lost ticks before
Khalid> returning current time and it fails to do
Khalid> that. do_gettimeofday() on other architectures compensate
Khalid> for lost ticks correctly. Due to this bug, if you repeatedly
Khalid> do clock_settime() immediately followed by clock_gettime()
Khalid> and compare the time returned by clock_gettime() to the time
Khalid> set by clock_settime(), you will eventually see clock going
Khalid> backwards. I am attaching a test program from POSIX
Khalid> testsuite at the end that exposes this bug. Run this test in
Khalid> a continuous loop that stops when test fails.
This explanation doesn't sound right. See the "lost" variable in
gettimeoffset(). It's supposed to account for lost ticks.
--david
next prev parent reply other threads:[~2003-09-24 18:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-24 17:21 [PATCH] do_gettimeofday() fails to compensate for lost ticks Khalid Aziz
2003-09-24 18:02 ` David Mosberger [this message]
2003-09-24 18:17 ` Khalid Aziz
2003-09-24 18:21 ` Jesse Barnes
2003-09-24 18:29 ` David Mosberger
2003-09-24 18:31 ` Khalid Aziz
2003-09-24 18:58 ` Khalid Aziz
2003-09-24 19:25 ` David Mosberger
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