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Re: [PATCH] migration: increase max-bandwidth to 128 MiB/s (1 Gib/s)
From: |
Greg Kurz |
Subject: |
Re: [PATCH] migration: increase max-bandwidth to 128 MiB/s (1 Gib/s) |
Date: |
Tue, 22 Sep 2020 09:02:16 +0200 |
On Mon, 21 Sep 2020 16:49:57 +0200
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>
> ---
Reviewed-by: Greg Kurz <groug@kaod.org>
> 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. */