Re: IDE Harddrive Performance

[Thomas Deselaers]

On Wed, Dec 19, 2001 at 11:20:22AM -0500, Mark Hahn wrote:
> > > I do have an Asus P2B-S Mainboard and since a week I have a Maxtor 60 GB
> 
> that's piix-based, is it not?

It is BX-chipset, not exactly sure if this is what is called piix. But I
think so and found this in /proc/ide/pix

                                Intel PIIX4 Ultra 33 Chipset.
--------------- Primary Channel ---------------- Secondary Channel
-------------                 enabled                          enabled
--------------- drive0 --------- drive1 -------- drive0 ---------- drive1
------DMA enabled:    yes              no              yes               no 
UDMA enabled:   yes              no              yes               no 
UDMA enabled:   2                X               2                 X
UDMA
DMA
PIO

> > >  Timing buffered disk reads:  64 MB in  5.63 seconds = 11.37 MB/sec
> 
> should be more like 30 MB/s, so you must not have the piix controller
> in your kernel.

I was expecting something above 20MB/s, and thus I wondered about the low
values. Well and when I tried first time, my computer was not really idle
and thus I only got something around 3.5 MB/s.
 

OK, what do I need to compile into my kernel to have the chipset configured
fine? Or do I need any boot-parameters?

Here is an excerpt from my kernel-config:

CONFIG_IDE=y
CONFIG_BLK_DEV_IDEDISK=y
CONFIG_IDEDISK_MULTI_MODE=y
CONFIG_BLK_DEV_IDECD=m
CONFIG_BLK_DEV_IDEPCI=y
CONFIG_IDEPCI_SHARE_IRQ=y
CONFIG_BLK_DEV_IDEDMA_PCI=y
CONFIG_BLK_DEV_ADMA=y
CONFIG_BLK_DEV_OFFBOARD=y
CONFIG_IDEDMA_PCI_AUTO=y
CONFIG_BLK_DEV_IDEDMA=y
CONFIG_BLK_DEV_PIIX=y
CONFIG_PIIX_TUNING=y
CONFIG_IDE_CHIPSETS=y
CONFIG_IDEDMA_AUTO=y
CONFIG_BLK_DEV_IDE_MODES=y

everything skipped is just not set.

Thanks, thomas
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