linux-kernel - Re: Sparc64 kernel message: BUG: soft lockup detected on CPU#3!

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Message-ID: <Pine.LNX.4.61.0610162358270.30479@yvahk01.tjqt.qr>
Date:	Tue, 17 Oct 2006 00:02:53 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	David Miller <davem@...emloft.net>
cc:	andrew@...rond.org, linux-kernel@...r.kernel.org
Subject: Re: Sparc64 kernel message: BUG: soft lockup detected on CPU#3!

>> >  [0000000000525990] prom_putchar+0x2c/0x34
>> 
>> I wonder; could this be a timeout during boot because the prom console
>> is hardware limited to 9600baud and its buffer is full ??
>
>PROM console is just slower than anything else for whatever
>reason.
>
>Even though PROM console drives the same output, using the
>native CONFIG_SERIAL_SUNHV is much faster and does not generate
>the timeouts.
>
>That's why I told the original poster to simply disable
>CONFIG_PROM_CONSOLE, it should never be used.

I have not seen this soft lockup so far, though I run a 2.6.16, most 
likely using CONFIG_PROM_CONSOLE (redirected to ttya by prom) because
the machine is not a SUN4V (which SUNHV seems to be for).

	-`J'
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