From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 107561] 4.2 breaks PCI passthrough in QEMU/KVM
Date: Thu, 10 Dec 2015 21:22:48 +0000
Message-ID: <bug-107561-28872-TH2bVMADYL@https.bugzilla.kernel.org/>
References: <bug-107561-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=107561

--- Comment #9 from Paolo Bonzini <bonzini@gnu.org> ---
Can you try the following on HostA:

1) providing *host* dmesg

2) disabling each MTRR starting from the first, until things are fast again. 
Then reboot and try disabling only the MTRR that made things fast again.

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