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Re: Problem with TLB mcheck!

To: Ralf Baechle <>
Subject: Re: Problem with TLB mcheck!
From: "Maciej W. Rozycki" <>
Date: Wed, 24 May 2006 17:29:45 +0100 (BST)
Cc: art <>,
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <> <> <>
On Wed, 24 May 2006, Ralf Baechle wrote:

> >  We have got PRId to filter out these.  Though rev. 2 of the architecture 
> > limits conditions when to raise the exception so it may eventually be a 
> > non-issue.
> Doesn't really help, the exception is asynchronous by definition, so the
> CPU can be far away by the time it's struck be the lightning bolt.
> Machine check is just a _bad_ place to be.

 It does help -- while it is asynchronous indeed, TLB writes are far rarer 
than reads and happen in well defined places and a machine check will 
happen within limited time after such a write attempt, at the very worst.  
With the 4Kc the machine check looks synchronous.


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