https://bugzilla.kernel.org/show_bug.cgi?id=47451
--- Comment #4 from Jay Ren yongjie@intel.com 2012-09-28 06:07:50 ---
(In reply to comment #3)
(In reply to comment #2)
(In reply to comment #1)
Can we narrow down the kvm.git commit range at all? The
one provided is over 12k
On 09/28/2012 11:15 AM, H. Peter Anvin wrote:
On 09/27/2012 10:38 PM, Raghavendra K T wrote:
+
+bool kvm_overcommitted()
+{
This better not be C...
I think you meant I should have had like kvm_overcommitted(void) and
(different function name perhaps)
or is it the body of function?
--
On 09/28/2012 02:37 AM, Jiannan Ouyang wrote:
On Thu, Sep 27, 2012 at 4:50 AM, Avi Kivity a...@redhat.com
mailto:a...@redhat.com wrote:
On 09/25/2012 04:43 PM, Jiannan Ouyang wrote:
I've actually implemented this preempted_bitmap idea.
Interesting, please share the code if you
Asias He as...@redhat.com writes:
I forgot about the cool hack which MST put in to defer event updates
using disable_cb/enable_cb.
Hmm, are you talking about virtqueue_enable_cb_delayed()?
Just the fact that virtqueue_disable_cb() prevents updates of
used_index, and then we do the update in
On 09/28/2012 02:08 PM, Rusty Russell wrote:
Asias He as...@redhat.com writes:
I forgot about the cool hack which MST put in to defer event updates
using disable_cb/enable_cb.
Hmm, are you talking about virtqueue_enable_cb_delayed()?
Just the fact that virtqueue_disable_cb() prevents
On 2012-09-27 21:18, Alex Williamson wrote:
On Thu, 2012-09-27 at 20:43 +0200, Martin Wolf wrote:
thank you for the information.
i will try what you mentioned...
do you have some additional information about rebooting a VM with a
passed through videocard?
(amd / ati 7870)
I don't. Is
Hi Paul,
Thank you for your comments, and sorry for my late reply.
On 2012/09/21 2:34, Paul E. McKenney wrote:
On Thu, Sep 06, 2012 at 08:27:40PM +0900, Tomoki Sekiyama wrote:
Initialize rcu related variables to avoid warnings about RCU usage while
slave CPUs is running specified functions.
On Thu, Sep 27, 2012 at 09:40:03AM +0930, Rusty Russell wrote:
I forgot about the cool hack which MST put in to defer event updates
using disable_cb/enable_cb.
I considered sticking some invalid value
in event index on disable but in my testing it did not seem to
give any gain, and knowing
On Fri, 2012-09-28 at 11:08 +0530, Raghavendra K T wrote:
Peter, Can I post your patch with your from/sob.. in V2?
Please let me know..
Yeah I guess ;-)
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-Original Message-
From: Avi Kivity [mailto:a...@redhat.com]
Sent: Thursday, September 27, 2012 6:12 PM
To: Hao, Xudong
Cc: kvm@vger.kernel.org; Zhang, Xiantao
Subject: Re: [PATCH v4] kvm/fpu: Enable fully eager restore kvm FPU
On 09/26/2012 07:54 AM, Hao, Xudong wrote:
It's sometimes necessary to query ring capacity after dequeueing a
buffer. Add an API for this.
Signed-off-by: Michael S. Tsirkin m...@redhat.com
---
drivers/virtio/virtio_ring.c | 19 +++
include/linux/virtio.h | 2 ++
2 files changed, 21 insertions(+)
diff --git
Capacity math on ring full is wrong: we are
looking at num_sg but that might be optimistic
because of indirect buffer use.
The implementation also penalizes fast path
with extra memory accesses for the benefit of
ring full condition handling which is slow path.
It's easy to query ring capacity
For small packets we can simplify xmit processing
by linearizing buffers with the header:
most packets seem to have enough head room
we can use for this purpose.
Since existing hypervisors require that header
is the first s/g element, we need a feature bit
for this.
Signed-off-by: Michael S.
Thinking about Sasha's patches, we can reduce ring usage
for virtio net small packets dramatically if we put
virtio net header inline with the data.
This can be done for free in case guest net stack allocated
extra head room for the packet, and I don't see
why would this have any downsides.
Even
Old qemu versions required that 1st s/g entry is the header.
My recent patchset titled virtio-net: iovec handling cleanup
removed this limitation but a feature
bit is needed so guests know it's safe to lay out
header differently.
This patch applies on top and adds such a feature bit.
virtio net
On Fri, 2012-09-28 at 11:08 +0530, Raghavendra K T wrote:
On 09/27/2012 05:33 PM, Avi Kivity wrote:
On 09/27/2012 01:23 PM, Raghavendra K T wrote:
This gives us a good case for tracking preemption on a per-vm basis. As
long as we aren't preempted, we can keep the PLE window high, and
On Fri, Sep 28, 2012 at 02:07:26AM +, Auld, Will wrote:
Marcelo,
I tagged my comments below with [auld] to make it easier to read.
Thanks,
Will
-Original Message-
From: Marcelo Tosatti [mailto:mtosa...@redhat.com]
Sent: Thursday, September 27, 2012 4:49 AM
To: Auld,
On Fri, 2012-09-28 at 06:40 -0500, Andrew Theurer wrote:
It will be interesting to see how this behaves with a very high lock
activity in a guest. Once the scheduler defers preemption, is it for
a
fixed amount of time, or does it know to cut the deferral short as
soon
as the lock depth is
On 09/28/2012 05:10 PM, Andrew Theurer wrote:
On Fri, 2012-09-28 at 11:08 +0530, Raghavendra K T wrote:
On 09/27/2012 05:33 PM, Avi Kivity wrote:
On 09/27/2012 01:23 PM, Raghavendra K T wrote:
[...]
Also there may be a lot of false positives (deferred preemptions even
when there is no
well my first tests with the vga rom were useless because of apparmor
rules i guess
now i placed the vga.rom in /usr/share/qemu ... well the error is gone
now but no changes ;)
so i added the bar parameter but it also made no difference :(
are you interested in the windows memory dump from the
On Fri, 2012-09-28 at 10:12 +0200, Jan Kiszka wrote:
On 2012-09-27 21:18, Alex Williamson wrote:
On Thu, 2012-09-27 at 20:43 +0200, Martin Wolf wrote:
thank you for the information.
i will try what you mentioned...
do you have some additional information about rebooting a VM with a
Hi,
i'm not very experienced in KVM. I installed two VM's in a raw image. I'm
impressed of the speed of the vm's, that's nice :-).
I have a lot of vm's running on VMWare Server 1.09, which is very old. I'd like
to migrate them to KVM.
I'd like to migrate them to raw images, because i'm able to
On 2012-09-28 17:50, Alex Williamson wrote:
On Fri, 2012-09-28 at 10:12 +0200, Jan Kiszka wrote:
On 2012-09-27 21:18, Alex Williamson wrote:
On Thu, 2012-09-27 at 20:43 +0200, Martin Wolf wrote:
thank you for the information.
i will try what you mentioned...
do you have some additional
PLE:
- works for unmodified / non-Linux guests
- works for all types of spins (e.g. smp_call_function*())
- utilizes an existing hardware interface (PAUSE instruction) so likely
more robust compared to a software interface
PV:
- has more information, so it can perform better
On Tue, Sep 25, 2012 at 11:08:58AM +0100, Daniel P. Berrange wrote:
On Wed, Sep 12, 2012 at 12:39:39PM -0300, Marcelo Tosatti wrote:
HW TSC scaling is a feature of AMD processors that allows a
multiplier to be specified to the TSC frequency exposed to the guest.
KVM also contains
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