Re: Possible performance issue with sata_sil og Gigabyte i-Ram

["Oddbjørn Kvalsund" <oddbjorn@nixx.no>]

On Tue 23 Jan 23:21, Alan wrote:
> > Other people using this device report of read/write speeds constantly
> > maxing out their SATA150 or PCI-bus. Is this my sil3114 being the
> > bottleneck? Other devices on the PCI-bus? My general system (see link to
> 
> Possibly. 80Mbytes/sec seems to be about all you get from PCI bus with
> many machines. Remember the SATA150, UDMA/133 and PCI bus limits are
> largely theoretical, especially as most ATA controllers have significant
> turn around time between commands and cannot queue.

Ah, alright. I'll try to remove the other cards on the PCI-bus to see if
that makes a difference, if not; well I guess 80 MB/s isn't that bad :)

> > from what I can tell from dmesg (U)DMA should be enabled for this drive.
> > I have tried enabling UDMA/133 for the controller (in sata_sil.c), giving this
> > output on boot:
> 
> If you are getting 80Mb/sec then UDMA is enabled 8)

Good!

> > I'm using the old piix-driver (not libata) for the IBM-disk, as I was
> > having some problems getting it to work with the libata-driver. I might
> 
> What sort of problems ? I've got an iRAM here for debugging/testing
> courtesy of a company using them and the one I have seems to pass all the
> testing I've thrown at it.

Sorry, I was cramming too much information into that sentence.

I was having problems getting the _IBM IDE-disk_, not the i-Ram, working
with the ata_piix. I haven't really dug deep into this, but I suspect
it's probably something silly like the drive changing identifier
(hda -> sda) or something like that.

Do you thing this (using the regular piix-driver for the IBM system disk
and the sata_sil-driver for the i-Ram) could be causing any performance
problems?

-- 
Oddbjørn Kvalsund