From: Nikita Danilov <Nikita@Namesys.COM>
To: timothy parkinson <t@timothyparkinson.com>
Cc: akpm@osdl.org, johnstul@us.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Better "Losing Ticks" Error Message
Date: Mon, 26 Jan 2004 14:10:44 +0300 [thread overview]
Message-ID: <16404.62900.619526.550375@laputa.namesys.com> (raw)
In-Reply-To: <20040124032147.GA177@h00a0cca1a6cf.ne.client2.attbi.com>
timothy parkinson writes:
>
> Andrew,
>
> Seems like a lot of people see the below error message, but aren't quite sure
> why it happens or how to fix it. I sure didn't.
>
> Here's my attempt at remedying that - Should apply cleanly against 2.6.1.
>
> Thanks,
> Timothy
>
> diff -urN linux-2.6.1-orig/arch/i386/kernel/timers/timer_tsc.c linux-2.6.1/arch/i386/kernel/timers/timer_tsc.c
> --- linux-2.6.1-orig/arch/i386/kernel/timers/timer_tsc.c 2004-01-09 01:59:46.000000000 -0500
> +++ linux-2.6.1/arch/i386/kernel/timers/timer_tsc.c 2004-01-23 21:16:24.000000000 -0500
> @@ -232,9 +232,13 @@
> /* sanity check to ensure we're not always losing ticks */
> if (lost_count++ > 100) {
> printk(KERN_WARNING "Losing too many ticks!\n");
> - printk(KERN_WARNING "TSC cannot be used as a timesource."
> - " (Are you running with SpeedStep?)\n");
> - printk(KERN_WARNING "Falling back to a sane timesource.\n");
> + printk(KERN_WARNING "TSC cannot be used as a timesource. ");
> + printk(KERN_WARNING "Possible reasons for this are:\n");
> + printk(KERN_WARNING " You're running with Speedstep,\n");
> + printk(KERN_WARNING " You don't have DMA enabled for your hard disk (see hdparm),\n");
> + printk(KERN_WARNING " Incorrect TSC synchronization on an SMP system (see dmesg).\n");
+#ifdef CONFIG_KGDB
+ printk(KERN_WARNING " You're single-stepping under kgdb (see what you are doing).\n");
+#endif
Modulo that person debugging kernel with kgdb probably understands this
anyway.
> + printk(KERN_WARNING "Falling back to a sane timesource now.\n");
> +
Nikita.
next prev parent reply other threads:[~2004-01-26 11:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-24 3:21 [PATCH] Better "Losing Ticks" Error Message timothy parkinson
2004-01-26 11:10 ` Nikita Danilov [this message]
2004-01-26 18:12 ` Pavel Machek
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