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Re: [PATCH v2 01/10] migration: Increase default number of multifd chann

From: Daniel P . Berrangé
Subject: Re: [PATCH v2 01/10] migration: Increase default number of multifd channels to 16
Date: Tue, 7 Jan 2020 13:42:05 +0000
User-agent: Mutt/1.12.1 (2019-06-15)

On Tue, Jan 07, 2020 at 02:32:24PM +0100, Juan Quintela wrote:
> Daniel P. Berrangé <address@hidden> wrote:
> >> - What does libvirt prefferes
> >
> > Libvirt doesn't really have an opinion in this case. I believe we'll
> > always set the number of channels on both src & dst, so we don't
> > see the defaults.
> What does libvirt does today for this value?

Libvirt doesn't have any default value. By default migration uses a
single connection.  The mgmt app can request multiple connections
for the migration, which will cause libvirt to turn on multifd with
the request channel count.

Essentially we avoid the problem by not having a separate tunable
for "multifd enable" & "multifd channels" - we only have one tunable
"connection count".  Thus the idea of enabling multifd with a default
channel count doesn't exist.

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