FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion

[Mike Tancsa]

At 01:47 PM 26/01/2005, Nick Pavlica wrote:
>All,
>   With the recent release of 4.11 I thought that I would give it a

Yes, I found the same thing basically.  My test box is a  P4 3Ghz with 2G 
of RAM on a 3ware 8605 controller with 4 drives in RAID5.  Virtually every 
test I did with iozone* showed a difference anywhere from 10-40% in favor 
of RELENG_4.


Note, this is a 2G RAM machine hence the odd result for the 1.5G test

               -------Sequential Output--------  ---Sequential Input-- 
--Random--
               -Per Char- --Block--- -Rewrite--  -Per Char- --Block--- 
--Seeks---
Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU  K/sec %CPU K/sec %CPU  /sec 
%CPU
4        1500 37673 23.7 37848  6.6 40784  7.7  97064 99.8 1174906 99.4 
89867.4 99.6
4        3000 38492 24.6 38753  7.0 18396  4.1  80355 
86.0  92051   9.9   605.1  1.0
5        1500 31226 23.0 34529  7.9 36444  8.9 110295 99.8  983156 92.5 
27388.8 99.6
5        3000 33820 26.1 34309  8.3 13339  3.7  59807 
56.8  68059   9.8   330.8  0.9


And a local postmark test. RELENG_4 and RELENG_5

pm>set size 300 100000
pm>set location /card0-a
pm>set transactions 400000
pm>run
Creating files...Done
Performing transactions..........Done
Deleting files...Done
Time:
         1219 seconds total
         1219 seconds of transactions (328 per second)

Files:
         200107 created (164 per second)
                 Creation alone: 500 files (500 per second)
                 Mixed with transactions: 199607 files (163 per second)
         199905 read (163 per second)
         199384 appended (163 per second)
         200107 deleted (164 per second)
                 Deletion alone: 889 files (889 per second)
                 Mixed with transactions: 199218 files (163 per second)

Data:
         12715.55 megabytes read (10.43 megabytes per second)
         12728.92 megabytes written (10.44 megabytes per second)
pm>


pm>set size 300 100000
pm>set location /card0-a
pm>set transactions 400000
pm>run
Creating files...Done
Performing transactions..........Done
Deleting files...Done
Time:
         2824 seconds total
         2822 seconds of transactions (141 per second)

Files:
         200107 created (70 per second)
                 Creation alone: 500 files (500 per second)
                 Mixed with transactions: 199607 files (70 per second)
         199905 read (70 per second)
         199384 appended (70 per second)
         200107 deleted (70 per second)
                 Deletion alone: 889 files (889 per second)
                 Mixed with transactions: 199218 files (70 per second)

Data:
         12715.55 megabytes read (4.50 megabytes per second)
         12728.92 megabytes written (4.51 megabytes per second)
pm>


*I have the iozone results in 2 .xls files if anyone wants to see them at

http://www.tancsa.com/iozone-r5vsr4.zip