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Re: Tester with IP27/IP30 needed

To: Kumba <>
Subject: Re: Tester with IP27/IP30 needed
From: Ralf Baechle <>
Date: Tue, 22 Jan 2008 15:49:58 +0000
Cc: Thomas Bogendoerfer <>, Florian Lohoff <>,,
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <> <>
User-agent: Mutt/1.5.17 (2007-11-01)
On Tue, Jan 22, 2008 at 10:20:06AM -0500, Kumba wrote:

> No effect on Octane R14000A, as far as lockups.  Spikes the CPU usage in 'ps
> aux', but that's about it.

So far it seems R12000 and R14000 are unaffected.

> If I can get my plucky IP32 R10K to boot again soon, I may try it there for
> kicks and giggles.  Maybe we're also seeing a side effect of the R10K's spec
> exec knocking the non-cache-coherent machines out?
> Also, tried building the code with the R10K cache barrier on to see if 
> anything
> else changes?  Generally reserved for kernel stuff, but Peter once speculated
> userland might have a use for it.

It's a cache instruction so priviledged which means userspace can't execute
it.  It's also entirely unclear if a cache barrier instruction would make a
difference at all.


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