[pve-devel] [PATCH] Add patch to improve qmrestore to RBD, activating writeback cache.

Eneko Lacunza elacunza at binovo.es
Wed Jul 27 09:48:33 CEST 2016


Sorry, this was on my /tmp, I didn't intend to re-send, please ignore.

El 27/07/16 a las 09:45, elacunza at binovo.es escribió:
> From: Eneko Lacunza <elacunza at pve-test.binovo.net>
>
> Signed-off-by: Eneko Lacunza <elacunza at binovo.es>
> ---
>   .../0054-vma-force-enable-rbd-cache-for-qmrestore.patch | 17 +++++++++++++++++
>   debian/patches/series                                   |  1 +
>   2 files changed, 18 insertions(+)
>   create mode 100644 debian/patches/pve/0054-vma-force-enable-rbd-cache-for-qmrestore.patch
>
> diff --git a/debian/patches/pve/0054-vma-force-enable-rbd-cache-for-qmrestore.patch b/debian/patches/pve/0054-vma-force-enable-rbd-cache-for-qmrestore.patch
> new file mode 100644
> index 0000000..d9722c7
> --- /dev/null
> +++ b/debian/patches/pve/0054-vma-force-enable-rbd-cache-for-qmrestore.patch
> @@ -0,0 +1,17 @@
> +Issue a bogus flush so that Ceph activates rbd cache, accelerating qmrestore to RBD.
> +---
> +Index: b/vma.c
> +===================================================================
> +--- a/vma.c
> ++++ b/vma.c
> +@@ -335,6 +335,9 @@ static int extract_content(int argc, cha
> +
> +            BlockDriverState *bs = blk_bs(blk);
> +
> ++            /* This is needed to activate rbd cache (writeback/coalesce) */
> ++            bdrv_flush(bs);
> ++
> +             if (vma_reader_register_bs(vmar, i, bs, write_zero, &errp) < 0) {
> +                 g_error("%s", error_get_pretty(errp));
> +             }
> +
> diff --git a/debian/patches/series b/debian/patches/series
> index 3614309..c858a30 100644
> --- a/debian/patches/series
> +++ b/debian/patches/series
> @@ -51,6 +51,7 @@ pve/0050-fix-possible-unitialised-return-value.patch
>   pve/0051-net-NET_CLIENT_OPTIONS_KIND_MAX-changed.patch
>   pve/0052-vnc-refactor-to-QIOChannelSocket.patch
>   pve/0053-vma-use-BlockBackend-on-extract.patch
> +pve/0054-vma-force-enable-rbd-cache-for-qmrestore.patch
>   #see https://bugs.launchpad.net/qemu/+bug/1488363?comments=all
>   extra/0001-Revert-target-i386-disable-LINT0-after-reset.patch
>   extra/0001-i386-kvmvapic-initialise-imm32-variable.patch


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