mirror of https://lore.kernel.org/lkml/
 help / color / mirror / Atom feed
From: Jim Paris <jim@jtan.com>
To: Willy Tarreau <willy@w.ods.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Re: time() glitch on 2.4.18: solved
Date: Tue, 5 Nov 2002 13:50:29 -0500	[thread overview]
Message-ID: <20021105135029.A6424@neurosis.mit.edu> (raw)
In-Reply-To: <20021105182019.GA25472@alpha.home.local>; from willy@w.ods.org on Tue, Nov 05, 2002 at 07:20:19PM +0100

> could that be the reason a few people have experienced occasionnal jumps
> backwards in gettimeofday() a few months ago, which many others could never
> reproduce ? Just because of buggy hardware ?

An unpaired read on port 0x40 is almost certainly the cause of e.g.

    http://www.uwsg.iu.edu/hypermail/linux/kernel/0206.0/1505.html

and we would expect to see the problem with count==LATCH about 1/11932
of the time, about 0.008% -- almost exactly the value reported in:

    http://www.uwsg.iu.edu/hypermail/linux/kernel/0206.3/0043.html

I believe that by adding both the (count > LATCH) check and a second
(count == LATCH) check, we can fix both of these.

-jim

  reply	other threads:[~2002-11-05 18:44 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-11-02  6:37 time() glitch on 2.4.18 at 177 days uptime? Jim Paris
2002-11-03 19:32 ` time() glitch on 2.4.18: solved Jim Paris
2002-11-03 20:30   ` Alan Cox
2002-11-05 16:30     ` [PATCH] " Jim Paris
2002-11-05 16:54       ` george anzinger
2002-11-05 17:10       ` Willy Tarreau
2002-11-05 18:16         ` Alan Cox
2002-11-05 18:02           ` Jim Paris
2002-11-05 18:37             ` Alan Cox
2002-11-05 18:20               ` Willy Tarreau
2002-11-05 18:50                 ` Jim Paris [this message]
2002-11-05 17:14       ` Willy Tarreau
2002-11-05 17:42         ` Jim Paris
2002-11-05 18:57           ` Richard B. Johnson
2002-11-05 19:08             ` Willy Tarreau
2002-11-05 19:29               ` Richard B. Johnson
2002-11-05 20:07                 ` Alan Cox
2002-11-05 20:14                   ` Willy Tarreau
2002-11-05 20:38                     ` Richard B. Johnson
2002-11-05 23:15                       ` Willy Tarreau
2002-11-06 12:47                         ` Richard B. Johnson
2002-11-06 13:25                           ` Alan Cox
2002-11-06 23:21                             ` Jim Paris
2002-11-05 20:23                   ` Richard B. Johnson
2002-11-05 20:57                     ` Alan Cox
2002-11-05 20:41                       ` Richard B. Johnson
2002-11-06 15:09                         ` Christer Weinigel
2002-11-06 15:49                           ` Richard B. Johnson
2002-11-05 20:06             ` Alan Cox
2002-11-05 17:32       ` Alan Cox

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20021105135029.A6424@neurosis.mit.edu \
    --to=jim@jtan.com \
    --cc=alan@lxorguk.ukuu.org.uk \
    --cc=linux-kernel@vger.kernel.org \
    --cc=willy@w.ods.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®