Hi all,
This is my first code contribution for Proxmox. Please correct my
wrongdoings with patch creation/code style/solution etc. :-)
This small patch adds a flag to devfn to force rbd cache (writeback
cache) activation for qmrestore, to improve performance on restore to
RBD. This follows our last week findings.
Tested with a 10GB disk restore with 44% sparse bytes, in our office
running cluster I get about 13,5MB/s without patch, 29MB/s with patch
this morning.
---
Index: b/vma.c
===================================================================
--- a/vma.c
+++ b/vma.c
@@ -328,6 +328,12 @@ static int extract_content(int argc, cha
}
+ /* Force rbd cache */
+ if (0 == strncmp(devfn, "rbd:", strlen("rbd:"))) {
+ char *devfn_new =
g_strdup_printf("%s:rbd_cache_writethrough_until_flush=false", devfn);
+ g_free(devfn);
+ devfn = devfn_new;
+ }
if (errp || !(blk = blk_new_open(devfn, NULL, options,
flags, &errp))) {
g_error("can't open file %s - %s", devfn,
error_get_pretty(errp));
--
Zuzendari Teknikoa / Director Técnico
Binovo IT Human Project, S.L.
Telf. 943493611
943324914
Astigarraga bidea 2, planta 6 dcha., ofi. 3-2; 20180 Oiartzun (Gipuzkoa)
www.binovo.es
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