Hi,All
while I use ceph as virtual machine backend, and execute imp operation, IO
performance is 1/10 as in physical machine,about 600kb/s
but execute dd for IO performance test,such as
dd /dev/zero bs=64k count=1000000 of=/1.file average IO speed is about
50m/s
here is physical machine result,while excute imp operation
top - 07:19:50 up 4 days, 1:29, 5 users, load average: 2.21, 4.66, 4.14
Tasks: 142 total, 1 running, 141 sleeping, 0 stopped, 0 zombie
Cpu(s): 3.5%us, 3.5%sy, 0.0%ni, 48.6%id, 44.3%wa, 0.1%hi, 0.0%si,
0.0%st
Mem: 1956020k total, 1939816k used, 16204k free, 118032k buffers
Swap: 4192956k total, 351660k used, 3841296k free, 1239960k cached
iostat
evice: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
sda 13.00 1561.00 89.00 88.00 7224.00 6456.00 154.58
7.46 40.70 5.65 100.00
avg-cpu: %user %nice %system %iowait %steal %idle
17.16 0.00 4.90 44.61 0.00 33.33
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
sda 4.00 1762.00 43.00 84.00 5592.00 7216.00 201.70
4.26 33.83 7.84 99.60
avg-cpu: %user %nice %system %iowait %steal %idle
13.46 0.00 3.37 32.21 0.00 50.96
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
sda 11.00 1198.00 42.00 106.00 3868.00 5076.00 120.86
2.95 21.51 6.76 100.00
avg-cpu: %user %nice %system %iowait %steal %idle
16.08 0.00 8.54 28.14 0.00 47.24
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
sda 0.00 2651.00 31.00 148.00 124.00 10956.00 123.80
2.56 14.37 5.50 98.40
here is virtual machine result while excute imp operation
when is begin, IO speed is same as physical machine
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
vda 0.00 17872.00 1.00 139.00 4.00 62720.00 896.06
187.16 1911.89 7.14 100.00
avg-cpu: %user %nice %system %iowait %steal %idle
0.82 0.00 8.45 64.31 0.00 26.43
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
vda 0.00 7722.00 1.00 43.00 4.00 16200.00 736.55
172.50 1380.36 22.73 100.00
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.72 76.57 0.00 22.71
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
vda 0.00 10132.00 0.00 123.00 0.00 55960.00 909.92
189.00 2288.46 8.13 100.00
but after memory usage rise, IO speed down as 1/10 of phyiscal machine
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.62 0.62 0.00 98.76
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
vda 0.00 86.14 0.00 160.40 0.00 665.35 8.30
1.04 6.25 6.17 99.01
avg-cpu: %user %nice %system %iowait %steal %idle
0.23 0.00 0.23 0.47 0.00 99.06
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
vda 0.00 94.00 0.00 188.00 0.00 752.00 8.00
1.00 5.57 5.34 100.40
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.50 0.99 0.00 98.51
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
vda 0.00 86.00 0.00 172.00 0.00 688.00 8.00
0.99 5.65 5.77 99.20
Thanks in advance
Michael
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