Re: [gentoo-amd64] Can I run a 32-bit kernel on my 64-bit kernel Gentoo machine?

[Mark Knecht <markknecht@gmail.com>]

On 9/26/05, Volker Armin Hemmann <volker.armin.hemmann@tu-clausthal.de> wrote:
> On Monday 26 September 2005 16:59, Mark Knecht wrote:
>
> > "Any disk activity seems to be the main cause of xruns on this machine."
> >
> >    If I get xruns (a failure mode of Jack-Audio-Connection-Kit running
> > on this hardware) then the machine is useless doing the sort of Linux
> > audio work I want to do so this is the problem I'm trying to solve.
> > That's my only goal.
>
> have you checked that 'unmaskirq' is set for your harddisk?
>
> hdparm /dev/hda should look like this:
> hdparm /dev/hda
>
> /dev/hda:
>  multcount    = 16 (on)
>  IO_support   =  1 (32-bit)
>  unmaskirq    =  1 (on)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    = 256 (on)
>  geometry     = 16383/255/63, sectors = 234493056, start = 0
>
> not this:
> hdparm /dev/hda
>
> /dev/hda:
>  multcount    =  0 (off)
>  IO_support   =  0 (default 16-bit)
>  unmaskirq    =  0 (off)
>  using_dma    =  1 (on)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    = 256 (on)
>  geometry     = 16383/255/63, sectors = 234493056, start = 0

Only problem is these are SATA drives and they don't tell me much
compared to EIDE drives when using hdparm. Also their error messages
running hdparm are a bit of a concern, although typical from what I've
read.

lightning ~ # hdparm /dev/sda

/dev/sda:
 IO_support   =  0 (default 16-bit)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 30401/255/63, sectors = 250059350016, start = 0
lightning ~ #
lightning ~ # hdparm -tT /dev/sda

/dev/sda:
 Timing cached reads:   2040 MB in  2.00 seconds = 1018.12 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
 Timing buffered disk reads:  198 MB in  3.02 seconds =  65.62 MB/sec
HDIO_DRIVE_CMD(null) (wait for flush complete) failed: Inappropriate
ioctl for device
lightning ~ #

Thanks,
Mark

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