From: David Gibson <david@gibson.dropbear.id.au>
To: Laurent Vivier <lvivier@redhat.com>
Cc: "Daniel P . Berrangé" <berrange@redhat.com>,
"Juan Quintela" <quintela@redhat.com>,
"Greg Kurz" <groug@kaod.org>,
qemu-devel@nongnu.org, "Andrea Bolognani" <abologna@redhat.com>,
"David Gibson" <dgibson@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
"Frediano Ziglio" <fziglio@redhat.com>
Subject: Re: [PATCH] migration: increase max-bandwidth to 128 MiB/s (1 Gib/s)
Date: Tue, 22 Sep 2020 10:46:15 +1000 [thread overview]
Message-ID: <20200922004615.GE17169@yekko.fritz.box> (raw)
In-Reply-To: <20200921144957.979989-1-lvivier@redhat.com>
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On Mon, Sep 21, 2020 at 04:49:57PM +0200, Laurent Vivier wrote:
> max-bandwidth is set by default to 32 MiB/s (256 Mib/s)
> since 2008 (5bb7910af031c).
>
> Most of the CPUs can dirty memory faster than that now,
> and this is clearly a problem with POWER where the page
> size is 64 kiB and not 4 KiB.
>
> Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
> ---
> migration/migration.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/migration/migration.c b/migration/migration.c
> index 58a5452471f9..1c4174947181 100644
> --- a/migration/migration.c
> +++ b/migration/migration.c
> @@ -57,7 +57,7 @@
> #include "qemu/queue.h"
> #include "multifd.h"
>
> -#define MAX_THROTTLE (32 << 20) /* Migration transfer speed throttling */
> +#define MAX_THROTTLE (128 << 20) /* Migration transfer speed throttling */
>
> /* Amount of time to allocate to each "chunk" of bandwidth-throttled
> * data. */
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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next prev parent reply other threads:[~2020-09-22 1:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-21 14:49 [PATCH] migration: increase max-bandwidth to 128 MiB/s (1 Gib/s) Laurent Vivier
2020-09-22 0:46 ` David Gibson [this message]
2020-09-22 7:02 ` Greg Kurz
2020-09-22 12:11 ` Dr. David Alan Gilbert
2020-09-23 19:02 ` Dr. David Alan Gilbert
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