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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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>,
	"Frediano Ziglio" <fziglio@redhat.com>
Subject: Re: [PATCH] migration: increase max-bandwidth to 128 MiB/s (1 Gib/s)
Date: Wed, 23 Sep 2020 20:02:39 +0100	[thread overview]
Message-ID: <20200923190239.GB150308@work-vm> (raw)
In-Reply-To: <20200921144957.979989-1-lvivier@redhat.com>

* Laurent Vivier (lvivier@redhat.com) 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>

Queued

> ---
>  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. */
> -- 
> 2.26.2
> 
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK



      parent reply	other threads:[~2020-09-23 19:04 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
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 [this message]

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