linux-kernel - intel-iommu: Dont cache iova above 32bit

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Date:	Wed, 13 Jul 2011 15:28:14 +0100
From:	Marcus Becker <marcus.disi@...il.com>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	kernel@...too.org
Subject: intel-iommu: Dont cache iova above 32bit - network copy freezes system

Hi,

With the upgrade to 2.6.39.2, I cannot copy more than ~1GB of data
over the network before my input devices lock up.
Example:
use scp on tty1 to copy a folder or file larger than 3GB over my
gigabit network and after ~1min the keyboard stops responding.
use cp on tty1 with an nfs-3 share mounted over the same network and
try to copy the same file, same happens

I can hit ctrl+c for about 20-30 sec and eventually get an interrupt
that stops the copying, then the input devices slowly gain control
again. If I do the same on X, there is no chance to get in between and
I have to use SysRq to reboot.

In our bug report at https://bugs.gentoo.org/show_bug.cgi?id=373109
We did a bisect between 2.6.39.1 and 2.6.39.2 and found the following
patch is causing this problem:

commit 87cc4d1e3e05af38c7c51323a3d86fe2572ab033
Author: Chris Wright <chrisw@...s-sol.org>
Date:   Sat May 28 13:15:04 2011 -0500

    intel-iommu: Dont cache iova above 32bit

I will also attach dmesg, current kernel config, and my bisect log (I
put a uname -a into the log after each bisect) plus git bisect log

Please let me know if you need more information.

Thanks,

Marcus

View attachment "config-2.6.39-r1.txt" of type "text/plain" (93083 bytes)

View attachment "dmesg.txt" of type "text/plain" (30916 bytes)

View attachment "git_bisect.txt" of type "text/plain" (3942 bytes)

View attachment "git_bisect_log.txt" of type "text/plain" (1529 bytes)