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

[Alexandre DERUMIER]

Hi,

I think that qemu-img convert have the same problem

I have found a commit from 2015
https://git.greensocs.com/fkonrad/mttcg/commit/80ccf93b884a2edab5ec62634758e942bba81b7c

By default it don't send flush (cache=unsafe), and the commit add a flush on image closing, because some storage like sheepdog,
can't do the flush by themself.

maybe can we add the same flush just after the opening in convert.



----- Mail original -----
De: "Eneko Lacunza" <elacunza at binovo.es>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Cc: "Eneko Lacunza" <elacunza at pve-test.binovo.net>
Envoyé: Mardi 26 Juillet 2016 15:18:55
Objet: [pve-devel] [PATCH] Add patch to improve qmrestore to RBD,	activating writeback cache.

From: Eneko Lacunza <elacunza at pve-test.binovo.net> 

Signed-off-by: Eneko Lacunza <elacunza at pve-test.binovo.net> 
--- 
.../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 
-- 
2.1.4 

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