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

[Mike Tancsa]

At 04:52 AM 28/01/2005, Robert Watson wrote:

>Just to get started, using dd to read and write at various block sizes is
>probably a decent start.  Take a few samples, make sure there's a decent
>sample size, etc, and don't count the first couple of runs.


I started over and installed the OS on a separate drive, so that the RAID5 
partition was one big partition. Bonnie seems fairly equal on the 2 
platforms. I am just putting together all the IOZONE tests as well which I 
will post later tonight / over the weekend.



               -------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
F        2000 33789 25.8 34065  8.3 14038  3.8 47484 44.6  67316  9.5 
2873.7  5.7
L        2000 28073 62.0 22391  4.3 12189  2.0 17577 35.5 102132  5.5 
1853.7  2.5

F=RELENG_5
L=2.6.10 LINUX

However, on the postmark tests, there seems to be quite a bit more difference.

RELENG_5 #2
[nfs]# time dd if=/dev/zero of=/mnt/test bs=16k count=2000
32768000 bytes transferred in 0.724865 secs (45205661 bytes/sec)
0.000u 0.066s 0:00.73 8.2%      33+281k 0+250io 0pf+0w
[nfs]# time dd if=/dev/zero of=/mnt/test bs=32k count=2000
65536000 bytes transferred in 1.731888 secs (37840788 bytes/sec)
0.000u 0.122s 0:01.74 6.8%      28+283k 0+500io 0pf+0w
[nfs]# time dd if=/dev/zero of=/mnt/test bs=64k count=2000
131072000 bytes transferred in 3.131403 secs (41857273 bytes/sec)
0.000u 0.245s 0:03.14 7.6%      25+335k 0+1000io 0pf+0w
[nfs]# time dd if=/dev/zero of=/mnt/test bs=128k count=2000
262144000 bytes transferred in 6.973014 secs (37594073 bytes/sec)
0.000u 0.509s 0:07.00 7.1%      26+510k 0+2000io 0pf+0w
[nfs]# time dd if=/dev/zero of=/mnt/test bs=256k count=2000
524288000 bytes transferred in 14.253915 secs (36782035 bytes/sec)
0.000u 1.003s 0:14.30 6.9%      25+784k 0+4000io 0pf+0w
[nfs]# time dd if=/dev/zero of=/mnt/test bs=512k count=2000
1048576000 bytes transferred in 28.135716 secs (37268502 bytes/sec)
0.008u 2.165s 0:28.21 7.6%      24+1386k 0+8000io 0pf+0w
[nfs]#


LINUX 2.6.10

pm>set size 300 100000
pm>set location /mnt
pm>set transactions 400000
pm>run
Creating files...Done
Performing transactions..........Done
Deleting files...Done
Time:
         1504 seconds total
         1503 seconds of transactions (266 per second)

Files:
         200107 created (133 per second)
                 Creation alone: 500 files (500 per second)
                 Mixed with transactions: 199607 files (132 per second)
         199905 read (133 per second)
         199384 appended (132 per second)
         200107 deleted (133 per second)
                 Deletion alone: 889 files (889 per second)
                 Mixed with transactions: 199218 files (132 per second)

Data:
         12715.55 megabytes read (8.45 megabytes per second)
         12728.92 megabytes written (8.46 megabytes per second)
pm>


RELENG_5.
PostMark v1.5 : 3/27/01
pm>set location /mnt
pm>size 300 100000
Eh?
pm>set size 300 100000
pm>set location /mnt
pm>set transactions 400000
pm>run
Creating files...Done
Performing transactions..........Done
Deleting files...Done
Time:
         2490 seconds total
         2487 seconds of transactions (160 per second)

Files:
         200107 created (80 per second)
                 Creation alone: 500 files (500 per second)
                 Mixed with transactions: 199607 files (80 per second)
         199905 read (80 per second)
         199384 appended (80 per second)
         200107 deleted (80 per second)
                 Deletion alone: 889 files (444 per second)
                 Mixed with transactions: 199218 files (80 per second)

Data:
         12715.55 megabytes read (5.11 megabytes per second)
         12728.92 megabytes written (5.11 megabytes per second)
pm>



RELENG_4 (Note, this was on a different partition on the RAID5 card

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>