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Old 12-14-2003, 06:47 PM   #1
Registered: Oct 2003
Posts: 95

Rep: Reputation: 15
Wierd message with poor HD performanc results

OK i am worried about this i get:

Uniform Multi-Platform E-IDE driver Revision: 7.00beta3-.2.4
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: IDE controller at PCI slot 00:07.1
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
VP_IDE: VIA vt82c686b (rev 40) IDE UDMA100 controller on pci00:07.1
ide0: BM-DMA at 0xc000-0xc007, BIOS settings: hdaMA, hdbMA
HPT370: IDE controller at PCI slot 00:0e.0
HPT370: chipset revision 3
HPT370: not 100% native mode: will probe irqs later
HPT37X: using 33MHz PCI clock
ide2: BM-DMA at 0xe000-0xe007, BIOS settings: hdeMA, hdfio
ide3: BM-DMA at 0xe008-0xe00f, BIOS settings: hdgMA, hdhio

Notice the 33Mhz PCI clock stuff

Now the Onboard RAID controller on this board Abit VP6 is supposed to run at 100, the drive is 100 but my hdparm results are:

Timing buffer-cache reads: 128 MB in 0.69 seconds =185.51 MB/sec
Timing buffered disk reads: 64 MB in 1.92 seconds = 33.33 MB/sec

Any thoughts on why thisis?

Old 12-14-2003, 07:00 PM   #2
Registered: Dec 2003
Location: Long Island, NY USA
Distribution: RedHat, SUSE
Posts: 336

Rep: Reputation: 30
The pcibus is running at 33Mhz and is 32bits( 4 bytes) wide. That means the theoretical max throughput is 33*4=132 MB/Sec.

Anyway single harddrive can delivered a sustain 100MB/s. When the drives are advertise as 100MB that is the ide busspeed. The drives have cache memory imbeaded in the drive, the cheaper have 2MB others have 8MB. The transfer to and from that cache can be quite large. I ofter see about 15MB/sec sustained using bonnie+ tests.

So you IDE bus is rated as 100MB/Sec and you PCI bus is 123 MB/Sec and you individual drive is 15Mb/sec sustained.
Old 12-14-2003, 07:17 PM   #3
Registered: Oct 2003
Posts: 95

Original Poster
Rep: Reputation: 15
Heheh cool

Hey i am gonna have to start payin ya soon, so is that speead above good avergae or poor?


btw the kernel is up and running thanks, hey how did you compile the module, basically i just put that module into the right dir from my prevoius kernel compiling and it worked when i ran the mk initrd command

Old 12-14-2003, 07:34 PM   #4
Registered: Dec 2003
Location: Long Island, NY USA
Distribution: RedHat, SUSE
Posts: 336

Rep: Reputation: 30
Cool glad to here the kernel think worked out for you.
The numbers looked good, but they looked like cache reads. If you really want to test you disks for performance run a
bonnie tests


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