From: Richard Miller <9fans@hamnavoe.com>
To: 9fans@9fans.net
Subject: Re: [9fans] Plan 9 on Xen 3.2.1 / 32-bit PAE Kernel / 64-bit
Date: Tue, 9 Feb 2010 15:23:16 +0000 [thread overview]
Message-ID: <d8c957b0d06496414bdcbbac9e2f0375@hamnavoe.com> (raw)
In-Reply-To: <f67cc20fc6197dd1779ef22560c58b06@ladd.quanstro.net>
> could you explain this a little further. pae would normally
> not be useful with 2gb of ram and is often of dubious utility
> on a 4gb machine. what's different about xen?
PAE is of no utility at all as far as I can see, but sometimes
we have to run xen guests on somebody else's hypervisor (think
virtual hosting companies). If the hypervisor is configured
with PAE (or 64-bit, it seems), the guest has to run in PAE mode.
I hacked the Plan 9 xen kernel to support PAE for this reason,
but since my xen test machine has only a couple of gigs I have
never actually seen it work in the non-trivial case where the
upper half of a 64-bit page address is non-zero. If our friend
has more than 4GB and the panic disappears when he uses less
than 2GB, that might indicate why he's having problems that
nobody else has seen.
next prev parent reply other threads:[~2010-02-09 15:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-09 1:12 [9fans] Plan 9 on Xen 3.2.1 / 32-bit PAE Kernel / 64-bit Hypervisor Kenneth L Van Alstyne
2010-02-09 10:36 ` Richard Miller
2010-02-09 15:01 ` erik quanstrom
2010-02-09 15:23 ` Richard Miller [this message]
2010-02-11 9:41 Jano
2010-02-11 10:30 ` [9fans] Plan 9 on Xen 3.2.1 / 32-bit PAE Kernel / 64-bit Richard Miller
2010-02-13 10:18 ` Richard Miller
2010-02-15 9:39 ` Jano
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