From: Hans de Goede <hdegoede@redhat.com>
To: Benjamin Herrenschmidt <benh@au1.ibm.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>,
li zhang <zhlcindy@gmail.com>,
qemu-devel@nongnu.org, zhlcindy@linux.vnet.ibm.com
Subject: Re: [Qemu-devel] [qemu-devel][RFC] Enable usb with default options
Date: Thu, 07 Jun 2012 10:32:37 +0200 [thread overview]
Message-ID: <4FD06725.70905@redhat.com> (raw)
In-Reply-To: <1339017219.7150.170.camel@pasglop>
Hi,
Sorry for jumping in the middle of the thread, I missed the beginning
of this. Enabling USB by default, esp. emulating a USB mouse by default
is a *bad* idea. They way the periodic schedule of the various USB
controllers works means that emulating a USB device means a 1000 vm exits
per second extra, even when the vm is completely idle! USB powermanagement
can be used to negate this, but this is off in both Linux and Windows for
HID devices by default because there are too many broken HID devices.
Regards,
Hans
next prev parent reply other threads:[~2012-06-07 8:32 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-05 9:48 [Qemu-devel] [qemu-devel][RFC] Enable usb with default options li zhang
2012-06-06 2:52 ` li zhang
2012-06-06 3:31 ` Benjamin Herrenschmidt
2012-06-06 5:42 ` Anthony Liguori
2012-06-06 6:03 ` li zhang
2012-06-06 21:13 ` Benjamin Herrenschmidt
2012-06-07 1:15 ` Anthony Liguori
2012-06-07 3:00 ` Benjamin Herrenschmidt
2012-06-07 3:03 ` Anthony Liguori
2012-06-07 4:52 ` li zhang
2012-06-07 4:39 ` li zhang
2012-06-07 4:43 ` Anthony Liguori
2012-06-07 4:53 ` li zhang
2012-06-07 8:07 ` Markus Armbruster
2012-06-07 9:19 ` Anthony Liguori
2012-06-07 10:05 ` Markus Armbruster
2012-06-07 11:51 ` Anthony Liguori
2012-06-12 8:06 ` Markus Armbruster
2012-06-07 8:32 ` Hans de Goede [this message]
2012-06-07 8:40 ` Benjamin Herrenschmidt
2012-06-07 8:49 ` Paolo Bonzini
2012-06-07 8:52 ` Hans de Goede
2012-06-07 9:05 ` Gerd Hoffmann
2012-06-07 9:17 ` Benjamin Herrenschmidt
2012-06-07 9:29 ` Li Zhang
2012-06-07 9:16 ` Benjamin Herrenschmidt
2012-06-07 9:50 ` Hans de Goede
2012-06-07 11:19 ` Benjamin Herrenschmidt
2012-06-07 11:35 ` Gerd Hoffmann
2012-06-07 8:54 ` Gerd Hoffmann
2012-06-06 22:14 ` Andreas Färber
-- strict thread matches above, loose matches on Subject: below --
2012-06-05 7:19 Li Zhang
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