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Re: [XenPPC] [PATCH] Flush the ERAT early for secondary CPUs

To: Amos Waterland <apw@xxxxxxxxxx>
Subject: Re: [XenPPC] [PATCH] Flush the ERAT early for secondary CPUs
From: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
Date: Sat, 11 Nov 2006 12:23:59 -0500
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On Nov 9, 2006, at 4:35 PM, Amos Waterland wrote:

Flush the ERAT very early on secondary processors.

Because Jimi has expressed skepticism about the need to do this, we
provide the following empirical and statistical arguments.

I have personally experienced this issue myself, since using the patch I have _not_. I'm excepting the patch as a "FW workaround" and simply as yet another thing we need to reset on the chip. Having said that, and the evidence of experienced stability, I would like to explore the possibility that this is indeed some ERAT pollution issue.

I don't know enough about Low Level FW (LLFW) not the POR cycle on the secondary processors, but I'd like to know more :) any insight out there?

-JX


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