Hi,
I recently upgraded my file server to a dual AMD 2800+ on a Tyan Tiger MPX
motherboard. The previous server was using a PIII 700 on an Intel 440BX
motherboard. I basically just took the IDE drives and their controllers
across to the new machine. The strange thing is that the RAID-5 performance
is worse than before! Have a look at the stats below:
I've fiddled with hdparm making sure the drives are setup correctly
(dma,32bit,unmaskirq) but without much improvement.
As a comparison I ran the same benchmark against the -single- (root)
drive /dev/hda and it performed better than the raid array!!
I'm using kernel version 2.4.26 SMP. Do you think upgrading to 2.6.8 would
improve matters?
The only guess I can make is that there is an issue with software raid
performance on an SMP system.
Any help/suggestions appreciated!
Thanks...
----------------------------------------------------------
Bonnie++ benchmarks:
Before (PIII 700/440BX):
128k chunk
-------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
1000 7594 85.1 36234 43.0 22728 31.1 8812 96.1 58155 52.5 286.8
5.6
After: (Dual AMD MP 2800+/Tiger MPX(AMD760)
-------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
1000 16707 97.7 20745 16.4 9633 9.8 17032 67.2 24741 11.4 194.8
2.1
/dev/md0:
Version : 00.90.00
Creation Time : Sat Apr 17 12:19:25 2004
Raid Level : raid5
Array Size : 234444288 (223.58 GiB 240.07 GB)
Device Size : 78148096 (74.53 GiB 80.02 GB)
Raid Devices : 4
Total Devices : 5
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon Oct 18 08:36:52 2004
State : dirty, no-errors
Active Devices : 4
Working Devices : 4
Failed Devices : 1
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 128K
Number Major Minor RaidDevice State
0 33 1 0 active sync /dev/hde1
1 34 1 1 active sync /dev/hdg1
2 56 1 2 active sync /dev/hdi1
3 57 1 3 active sync /dev/hdk1
UUID : 775f1dcf:7cbc17ab:86e1e792:669b732f
Events : 0.82
lspci:
0000:00:00.0 Host bridge: Advanced Micro Devices [AMD] AMD-760 MP [IGD4-2P]
System Controller (rev 20)
0000:00:01.0 PCI bridge: Advanced Micro Devices [AMD] AMD-760 MP [IGD4-2P]
AGP Bridge
0000:00:07.0 ISA bridge: Advanced Micro Devices [AMD] AMD-768 [Opus] ISA
(rev 05)
0000:00:07.1 IDE interface: Advanced Micro Devices [AMD] AMD-768 [Opus] IDE
(rev 04)
0000:00:07.3 Bridge: Advanced Micro Devices [AMD] AMD-768 [Opus] ACPI (rev
03)
0000:00:10.0 PCI bridge: Advanced Micro Devices [AMD] AMD-768 [Opus] PCI
(rev 05)
0000:02:00.0 USB Controller: Advanced Micro Devices [AMD] AMD-768 [Opus] USB
(rev 07)
0000:02:04.0 VGA compatible controller: NVidia / SGS Thomson (Joint Venture)
Riva128 (rev 10)
0000:02:05.0 RAID bus controller: Silicon Image, Inc. (formerly CMD
Technology Inc) PCI0680 Ultra ATA-133 Host Controller (rev 02)
0000:02:06.0 RAID bus controller: Silicon Image, Inc. (formerly CMD
Technology Inc) PCI0649 (rev 02)
0000:02:07.0 FireWire (IEEE 1394): Texas Instruments TSB12LV23 IEEE-1394
Controller
0000:02:08.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado]
(rev 78)
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