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From: Grant Grundler <grundler@puffin.external.hp.com>
To: parisc-linux@parisc-linux.org
Subject: Re: [parisc-linux] travel backwards in time?
Date: Thu, 29 Nov 2001 11:58:19 -0700	[thread overview]
Message-ID: <200111291858.LAA02339@puffin.external.hp.com> (raw)
In-Reply-To: Message from Randolph Chung <randolph@tausq.org> of "Thu, 18 Oct 2001 13:21:45 PDT." <20011018132145.H4123@tausq.org>

Randolph Chung wrote:
> Recently Grant and I have observed several hangs in do_gettimeofday on a
> c3k running 32 or 64-bit kernels (UP). 
> 
> The symptom we see is gettimeoffset returns a negative number which
> results in a huge (unsigned) usec offset in do_gettimeofday, which ends
> up spinning in a while loop.
...
> The last_tick adjustment looks a bit odd. Looking at ia64, it looks more
> like this:
> 
>         last_tick -= clocktick * (jiffies - wall_jiffies + 1);

For the record, this fix was committed in one of the 2.4.14-pa5
http://lists.parisc-linux.org/pipermail/parisc-linux-cvs/2001-November/030021.html

I'm still not 100% certain all our time keeping code is correct.
But I'm comfortable this patch fixes the problem we saw and
does not introduce any new ones.

grant

  parent reply	other threads:[~2001-11-29 19:02 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <randolph@tausq.org>
2001-10-18 20:21 ` [parisc-linux] travel backwards in time? Randolph Chung
2001-10-18 23:23   ` Paul Bame
2001-11-29 18:58   ` Grant Grundler [this message]
2001-12-04  7:17 ` [parisc-linux] 2.4.16-pa12 broken on c3000 Randolph Chung
2001-12-05 17:45   ` Grant Grundler

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