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Re: [PATCH] Re: tmem on 4.1 (was [Xen-devel] Re: Freeze schedule)

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Subject: Re: [PATCH] Re: tmem on 4.1 (was [Xen-devel] Re: Freeze schedule)
From: "Olivier B." <xen.list@xxxxxxxxx>
Date: Thu, 20 Jan 2011 10:13:11 +0100
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Le 20/01/2011 09:23, Ian Campbell a écrit :
On Thu, 2011-01-20 at 08:07 +0000, Olivier B. wrote:
Well, it is present but disabled in the new Debian Squeeze kernel...
Do you really mean the kernel (i.e. Linux) or do you really mean the

I was not aware of any tmem support (disabled or otherwise) in the
Debian Squeeze Linux _kernel_. It hasn't been deliberately patched in
and it does not appear to be in the xen.git snapshot used in the Xen
dom0 flavour of the kernel.

You are right that it is present and disabled in the Squeeze hypervisor
-- this is simply the default in the Xen 4.0.1 release and hasn't been
tweaked by Debian.


I don't know, on a Squeeze Dom0 with "tmem" parameters on default hypervisor and kernel, I have that :

root! yunze:~# xm tmem-list -a

Is it "suffisant" to say that it works ?

but :
root! yunze:~# xm list 9
Name ID Mem VCPUs State Time(s) rome 9 512 2 -b---- 11.8
root! yunze:~# xm tmem-list 9

and from the VM :
root! rome:~# cat /proc/cmdline
root=/dev/mapper/vg--rome-root ro rootflags=data=writeback rootdelay=1 panic=60 swiotlb=force iommu=soft tmem
root! rome:~# uname -a
Linux rome 2.6.32-5-xen-amd64 #1 SMP Wed Jan 12 05:46:49 UTC 2011 x86_64 GNU/Linux

But as I was saying, this is difficult to find any documentation, so I really don't know what is wrong or not...


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