Kevin Wolf writes:
> Am 13.05.2020 um 12:53 hat Dr. David Alan Gilbert geschrieben:
>> * Kevin Wolf (kw...@redhat.com) wrote:
>> > Am 12.05.2020 um 11:43 hat Daniel P. Berrangé geschrieben:
>> > > On Tue, May 12, 2020 at 11:32:06AM +0200, Lukas Straub wrote:
>> > > > On Mon, 11 May 2020
* Lukas Straub (lukasstra...@web.de) wrote:
> Terminology:
> instance = one (nbd) blockdev/one chardev/the single migrationstate
> connection = one TCP connection
>
> Hello Everyone,
> Having read all the comments, here is proposal v2:
> Every instance registers itself with a unique name in the
Am 13.05.2020 um 21:12 hat Lukas Straub geschrieben:
> Terminology:
> instance = one (nbd) blockdev/one chardev/the single migrationstate
> connection = one TCP connection
>
> Hello Everyone,
> Having read all the comments, here is proposal v2:
Looks quite good to me.
> Every instance registers
Terminology:
instance = one (nbd) blockdev/one chardev/the single migrationstate
connection = one TCP connection
Hello Everyone,
Having read all the comments, here is proposal v2:
Every instance registers itself with a unique name in the form
"blockdev:", "chardev:" and "migration" using
On 5/13/20 9:06 AM, Kevin Wolf wrote:
One more thing to consider is, what if a single object has multiple
connections? In the case of node-names, we have a limited set of allowed
characters, so we can use one of the remaining characters as a separator
and then suffix a counter. In other places,
Am 13.05.2020 um 15:48 hat Dr. David Alan Gilbert geschrieben:
> * Daniel P. Berrangé (berra...@redhat.com) wrote:
> > On Wed, May 13, 2020 at 01:56:24PM +0100, Dr. David Alan Gilbert wrote:
> > > * Kevin Wolf (kw...@redhat.com) wrote:
> > > > I guess it would be nice to have a single namespace
On 5/13/20 8:48 AM, Dr. David Alan Gilbert wrote:
Yeh I worry about whether on nbd if you can have multiple nbd
connections to one block device.
The kernel NBD driver now supports multiple parallel connections.
QEMU hasn't implemented this in its NBD code yet, but I certainly
see that being
* Daniel P. Berrangé (berra...@redhat.com) wrote:
> On Wed, May 13, 2020 at 01:56:24PM +0100, Dr. David Alan Gilbert wrote:
> > * Kevin Wolf (kw...@redhat.com) wrote:
> > > I guess it would be nice to have a single namespace for everything in
> > > QEMU, but the reality is that we have a few
On Wed, May 13, 2020 at 01:56:24PM +0100, Dr. David Alan Gilbert wrote:
> * Kevin Wolf (kw...@redhat.com) wrote:
> > I guess it would be nice to have a single namespace for everything in
> > QEMU, but the reality is that we have a few separate ones. As long as we
> > consistently add a prefix that
* Kevin Wolf (kw...@redhat.com) wrote:
> Am 13.05.2020 um 12:53 hat Dr. David Alan Gilbert geschrieben:
> > * Kevin Wolf (kw...@redhat.com) wrote:
> > > Am 12.05.2020 um 11:43 hat Daniel P. Berrangé geschrieben:
> > > > On Tue, May 12, 2020 at 11:32:06AM +0200, Lukas Straub wrote:
> > > > > On
Am 13.05.2020 um 13:58 hat Paolo Bonzini geschrieben:
> On 13/05/20 13:26, Daniel P. Berrangé wrote:
> > Are you referring to the in-kernel NFS client hangs here ? AFAIK, it is
> > impossible to do anything to get out of those hangs from userspace, because
> > the thread is stuck in an
* Paolo Bonzini (pbonz...@redhat.com) wrote:
> On 13/05/20 13:26, Daniel P. Berrangé wrote:
> > Are you referring to the in-kernel NFS client hangs here ? AFAIK, it is
> > impossible to do anything to get out of those hangs from userspace, because
> > the thread is stuck in an uninterruptable
Am 13.05.2020 um 13:26 hat Daniel P. Berrangé geschrieben:
> On Wed, May 13, 2020 at 01:13:20PM +0200, Kevin Wolf wrote:
> > Am 13.05.2020 um 12:53 hat Dr. David Alan Gilbert geschrieben:
> > > * Kevin Wolf (kw...@redhat.com) wrote:
> > > > Am 12.05.2020 um 11:43 hat Daniel P. Berrangé
On 13/05/20 13:26, Daniel P. Berrangé wrote:
> Are you referring to the in-kernel NFS client hangs here ? AFAIK, it is
> impossible to do anything to get out of those hangs from userspace, because
> the thread is stuck in an uninterruptable sleep in kernel space.
>
> If using the in-QEMU NFS
On Wed, May 13, 2020 at 01:13:20PM +0200, Kevin Wolf wrote:
> Am 13.05.2020 um 12:53 hat Dr. David Alan Gilbert geschrieben:
> > * Kevin Wolf (kw...@redhat.com) wrote:
> > > Am 12.05.2020 um 11:43 hat Daniel P. Berrangé geschrieben:
> > > > On Tue, May 12, 2020 at 11:32:06AM +0200, Lukas Straub
Am 13.05.2020 um 12:53 hat Dr. David Alan Gilbert geschrieben:
> * Kevin Wolf (kw...@redhat.com) wrote:
> > Am 12.05.2020 um 11:43 hat Daniel P. Berrangé geschrieben:
> > > On Tue, May 12, 2020 at 11:32:06AM +0200, Lukas Straub wrote:
> > > > On Mon, 11 May 2020 16:46:45 +0100
> > > > "Dr. David
* Kevin Wolf (kw...@redhat.com) wrote:
> Am 12.05.2020 um 11:43 hat Daniel P. Berrangé geschrieben:
> > On Tue, May 12, 2020 at 11:32:06AM +0200, Lukas Straub wrote:
> > > On Mon, 11 May 2020 16:46:45 +0100
> > > "Dr. David Alan Gilbert" wrote:
> > >
> > > > * Daniel P. Berrangé
Am 12.05.2020 um 11:43 hat Daniel P. Berrangé geschrieben:
> On Tue, May 12, 2020 at 11:32:06AM +0200, Lukas Straub wrote:
> > On Mon, 11 May 2020 16:46:45 +0100
> > "Dr. David Alan Gilbert" wrote:
> >
> > > * Daniel P. Berrangé (berra...@redhat.com) wrote:
> > > > ...
> > > > That way if
On Tue, May 12, 2020 at 07:58:17PM +0100, Dr. David Alan Gilbert wrote:
> * Daniel P. Berrangé (berra...@redhat.com) wrote:
> > On Tue, May 12, 2020 at 11:32:06AM +0200, Lukas Straub wrote:
> > > On Mon, 11 May 2020 16:46:45 +0100
> > > "Dr. David Alan Gilbert" wrote:
> > >
> > > > * Daniel
On Tue, 12 May 2020 10:43:37 +0100
Daniel P. Berrangé wrote:
> On Tue, May 12, 2020 at 11:32:06AM +0200, Lukas Straub wrote:
> > ...
> >
> > Good Idea. We could name the connections (/yank callbacks) in the
> > form "nbd:", "chardev:" and "migration"
> > (and add "netdev:...", etc. in the
* Daniel P. Berrangé (berra...@redhat.com) wrote:
> On Tue, May 12, 2020 at 11:32:06AM +0200, Lukas Straub wrote:
> > On Mon, 11 May 2020 16:46:45 +0100
> > "Dr. David Alan Gilbert" wrote:
> >
> > > * Daniel P. Berrangé (berra...@redhat.com) wrote:
> > > > ...
> > > > That way if QEMU does
On Tue, May 12, 2020 at 11:32:06AM +0200, Lukas Straub wrote:
> On Mon, 11 May 2020 16:46:45 +0100
> "Dr. David Alan Gilbert" wrote:
>
> > * Daniel P. Berrangé (berra...@redhat.com) wrote:
> > > ...
> > > That way if QEMU does get stuck, you can start by tearing down the
> > > least
On Mon, 11 May 2020 16:46:45 +0100
"Dr. David Alan Gilbert" wrote:
> * Daniel P. Berrangé (berra...@redhat.com) wrote:
> > ...
> > That way if QEMU does get stuck, you can start by tearing down the
> > least distruptive channel. eg try tearing down the migration connection
> > first (which
* Lukas Straub (lukasstra...@web.de) wrote:
> On Mon, 11 May 2020 12:49:47 +0100
> Daniel P. Berrangé wrote:
>
> > On Mon, May 11, 2020 at 01:14:34PM +0200, Lukas Straub wrote:
> > > Hello Everyone,
> > > In many cases, if qemu has a network connection (qmp, migration, chardev,
> > > etc.)
> >
* Daniel P. Berrangé (berra...@redhat.com) wrote:
> On Mon, May 11, 2020 at 08:12:18PM +0200, Lukas Straub wrote:
> > On Mon, 11 May 2020 12:49:47 +0100
> > Daniel P. Berrangé wrote:
> >
> > > On Mon, May 11, 2020 at 01:14:34PM +0200, Lukas Straub wrote:
> > > > Hello Everyone,
> > > > In many
On Mon, May 11, 2020 at 08:12:18PM +0200, Lukas Straub wrote:
> On Mon, 11 May 2020 12:49:47 +0100
> Daniel P. Berrangé wrote:
>
> > On Mon, May 11, 2020 at 01:14:34PM +0200, Lukas Straub wrote:
> > > Hello Everyone,
> > > In many cases, if qemu has a network connection (qmp, migration, chardev,
On Mon, 11 May 2020 13:17:14 +0100
Daniel P. Berrangé wrote:
> On Mon, May 11, 2020 at 01:07:18PM +0100, Dr. David Alan Gilbert wrote:
> > * Daniel P. Berrangé (berra...@redhat.com) wrote:
> > > On Mon, May 11, 2020 at 01:14:34PM +0200, Lukas Straub wrote:
> > > > Hello Everyone,
> > > > In
On Mon, 11 May 2020 12:49:47 +0100
Daniel P. Berrangé wrote:
> On Mon, May 11, 2020 at 01:14:34PM +0200, Lukas Straub wrote:
> > Hello Everyone,
> > In many cases, if qemu has a network connection (qmp, migration, chardev,
> > etc.)
> > to some other server and that server dies or hangs, qemu
* Daniel P. Berrangé (berra...@redhat.com) wrote:
> On Mon, May 11, 2020 at 01:07:18PM +0100, Dr. David Alan Gilbert wrote:
> > * Daniel P. Berrangé (berra...@redhat.com) wrote:
> > > On Mon, May 11, 2020 at 01:14:34PM +0200, Lukas Straub wrote:
> > > > Hello Everyone,
> > > > In many cases, if
On Mon, May 11, 2020 at 01:07:18PM +0100, Dr. David Alan Gilbert wrote:
> * Daniel P. Berrangé (berra...@redhat.com) wrote:
> > On Mon, May 11, 2020 at 01:14:34PM +0200, Lukas Straub wrote:
> > > Hello Everyone,
> > > In many cases, if qemu has a network connection (qmp, migration, chardev,
> > >
* Daniel P. Berrangé (berra...@redhat.com) wrote:
> On Mon, May 11, 2020 at 01:14:34PM +0200, Lukas Straub wrote:
> > Hello Everyone,
> > In many cases, if qemu has a network connection (qmp, migration, chardev,
> > etc.)
> > to some other server and that server dies or hangs, qemu hangs too.
>
On Mon, May 11, 2020 at 01:14:34PM +0200, Lukas Straub wrote:
> Hello Everyone,
> In many cases, if qemu has a network connection (qmp, migration, chardev,
> etc.)
> to some other server and that server dies or hangs, qemu hangs too.
If qemu as a whole hangs due to a stalled network connection,
Hello Everyone,
In many cases, if qemu has a network connection (qmp, migration, chardev, etc.)
to some other server and that server dies or hangs, qemu hangs too.
These patches introduce the new 'yank' out-of-band qmp command to recover from
these kinds of hangs. The different subsystems register
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