[pve-devel] [PATCH] rbdplugin : disable debug_ms to increase performance

[Alexandre DERUMIER]

any comment to commit this ?


----- Mail original -----
De: "Alexandre Derumier" <aderumier at odiso.com>
À: "pve-devel" <pve-devel at pve.proxmox.com>
Cc: "Alexandre Derumier" <aderumier at odiso.com>
Envoyé: Samedi 5 Novembre 2016 15:43:12
Objet: [PATCH] rbdplugin : disable debug_ms to increase performance

This increase iops and decrease latencies by around 30% 

debus_ms=1 (current) 
-------------------- 
test: (groupid=0, jobs=1): err= 0: pid=1222: Sat Nov 5 10:04:23 2016 
read : io=15360MB, bw=127472KB/s, iops=31867, runt=123389msec 
slat (usec): min=1, max=9774, avg= 5.91, stdev=16.19 
clat (usec): min=147, max=398690, avg=2000.78, stdev=4521.22 
lat (usec): min=174, max=398707, avg=2006.87, stdev=4521.26 
clat percentiles (usec): 
| 1.00th=[ 434], 5.00th=[ 764], 10.00th=[ 988], 20.00th=[ 1224], 
| 30.00th=[ 1352], 40.00th=[ 1448], 50.00th=[ 1544], 60.00th=[ 1656], 
| 70.00th=[ 1816], 80.00th=[ 2096], 90.00th=[ 3024], 95.00th=[ 4640], 
| 99.00th=[ 8640], 99.50th=[10560], 99.90th=[16192], 99.95th=[25216], 
| 99.99th=[203776] 

debug_ms=0 
---------- 
test: (groupid=0, jobs=1): err= 0: pid=1423: Sat Nov 5 09:59:25 2016 
read : io=15360MB, bw=176625KB/s, iops=44156, runt= 89051msec 
slat (usec): min=2, max=8995, avg= 6.70, stdev=11.06 
clat (usec): min=59, max=444656, avg=1438.46, stdev=4094.54 
lat (usec): min=156, max=444660, avg=1446.29, stdev=4094.56 
clat percentiles (usec): 
| 1.00th=[ 290], 5.00th=[ 498], 10.00th=[ 636], 20.00th=[ 796], 
| 30.00th=[ 900], 40.00th=[ 972], 50.00th=[ 1048], 60.00th=[ 1128], 
| 70.00th=[ 1240], 80.00th=[ 1432], 90.00th=[ 2192], 95.00th=[ 3664], 
| 99.00th=[ 7584], 99.50th=[ 9408], 99.90th=[14784], 99.95th=[19840], 
| 99.99th=[203776] 
bw (KB /s): min=22094, max=232384, per=100.00%, avg=176976.30, 

Signed-off-by: Alexandre Derumier <aderumier at odiso.com> 
--- 
PVE/Storage/RBDPlugin.pm | 2 ++ 
1 file changed, 2 insertions(+) 

diff --git a/PVE/Storage/RBDPlugin.pm b/PVE/Storage/RBDPlugin.pm 
index c1f88e4..6459f98 100644 
--- a/PVE/Storage/RBDPlugin.pm 
+++ b/PVE/Storage/RBDPlugin.pm 
@@ -326,6 +326,8 @@ sub path { 
$path .= ":auth_supported=none"; 
} 

+ $path .= ":debug_ms=0/0"; 
+ 
my $cephconfig = "/etc/pve/priv/ceph/${storeid}.conf"; 

if (-e $cephconfig) { 
-- 
2.1.4