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Bug #104
closedHigh io wait on Elwing
Start date:
2010-06-17
Due date:
% Done:
20%
Estimated time:
Patch Available:
No
Confirmed:
No
Branch:
Entity:
DuckCorp
Security:
No
Help Needed:
Description
We are experiencing slow responses sometimes on Elwing, and it seems to affect NFS a lot.
I found high io wait lasting more than a few seconds, and sometimes several minutes long.
I looked at a bonnie++ check:
Version 1.96 ------Sequential Output------ --Sequential Input- --Random- Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP Elwing 8G 347 95 25089 7 16206 3 397 22 58156 5 82.4 2 Latency 112ms 11751ms 4522ms 2791ms 9326ms 17265ms Version 1.96 ------Sequential Create------ --------Random Create-------- Elwing -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 5138 10 +++++ +++ 6805 11 12978 25 +++++ +++ 7334 12 Latency 24172us 560us 651us 1317us 105us 252us 1.96,1.96,Elwing,1,1276727105,8G,,347,95,25089,7,16206,3,397,22,58156,5,82.4,2,16,,,,,5138,10,+++++,+++,6805,11,12978,25,+++++,+++,7334,12,112ms,11751ms,4522ms,2791ms,9326ms,17265ms,24172us,560us,651us,1317us,105us,252us
And for comparison, here is the same on Annael:
Version 1.96 ------Sequential Output------ --Sequential Input- --Random- Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP Annael 8G 682 97 73985 13 42083 5 3548 85 19836 1 271.3 4 Latency 12457us 2543ms 349ms 67604us 347s 433ms Version 1.96 ------Sequential Create------ --------Random Create-------- Annael -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 15253 18 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ Latency 11974us 623us 490us 966us 194us 113us 1.96,1.96,Annael,1,1276738616,8G,,682,97,73985,13,42083,5,3548,85,19836,1,271.3,4,16,,,,,15253,18,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,12457us,2543ms,349ms,67604us,347s,433ms,11974us,623us,490us,966us,194us,113us
HD temperatures are about 43-45°C, which is a bit high, but is the same as on Daneel, which is working fine.
I need to investigate more.
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