Re: [Xen-devel] Problems with DMA in xen0

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

This is almost certainly a build misconfiguration, such that the
kernel doesn't really know about your chipset, or some generic disk
DMA option is disabled in you XenLinux config.

 -- Keir

> Hi list,
> 
> I'm doing currently some tests with xen in order to migrate a development 
> environment from User Mode Linux to Xen. So far, Xen looks very promising.
> My only problem currently is that my xen0 kernel seems no to be able to use 
> DMA modes for hard disk access.
> 
> With the xen0 kernel (2.6.8.1), hdparm shows me
>   hdparm -t /dev/hda
>   /dev/hda:
>   Timing buffered disk reads:   10 MB in  3.08 seconds =   3.25 MB/sec
> When I boot with a standard non-Xen kernel (2.6.7), I get about 52 MB/sec.
> In both kernels support for my Intel boad Chipset () is enabled.
> When I try to set DMA with hdparm manually:
>  hdparm -u1 -d1 -X66 -m 16 -c 3 -W 1 /dev/hda
> /dev/hda:
>  setting 32-bit IO_support flag to 3
>  setting multcount to 16
>  setting unmaskirq to 1 (on)
>  setting using_dma to 1 (on)
>  HDIO_SET_DMA failed: Operation not permitted
>  setting xfermode to 66 (UltraDMA mode2)
>  setting drive write-caching to 1 (on)
>  multcount    = 16 (on)
>  IO_support   =  3 (32-bit w/sync)
>  unmaskirq    =  1 (on)
>  using_dma    =  0 (off)
> 
> I'm using the nightly snapshot tarball xen-unstable from yesterday. 
> Any ideas what's the problem ?
> 
> Regards,
> 
> Matthias Hofherr
> 
> -- 
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>  Matthias Hofherr             EMail: Matthias_Hofherr@xxxxxxxx
>  GeNUA Gesellschaft fuer Netzwerk- und Unix-Administration mbH
>  Domagkstraße 7, D-85551 Kirchheim     Tel.+49 (89) 99 19 50-0
> <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< 
> 
> 
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 -=- MIME -=- 
Hi list,

I'm doing currently some tests with xen in order to migrate a development=20
environment from User Mode Linux to Xen. So far, Xen looks very promising.
My only problem currently is that my xen0 kernel seems no to be able to use=
=20
DMA modes for hard disk access.

With the xen0 kernel (2.6.8.1), hdparm shows me
  hdparm -t /dev/hda
  /dev/hda:
  Timing buffered disk reads:   10 MB in  3.08 seconds =3D   3.25 MB/sec
When I boot with a standard non-Xen kernel (2.6.7), I get about 52 MB/sec.
In both kernels support for my Intel boad Chipset () is enabled.
When I try to set DMA with hdparm manually:
 hdparm -u1 -d1 -X66 -m 16 -c 3 -W 1 /dev/hda
/dev/hda:
 setting 32-bit IO_support flag to 3
 setting multcount to 16
 setting unmaskirq to 1 (on)
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 setting xfermode to 66 (UltraDMA mode2)
 setting drive write-caching to 1 (on)
 multcount    =3D 16 (on)
 IO_support   =3D  3 (32-bit w/sync)
 unmaskirq    =3D  1 (on)
 using_dma    =3D  0 (off)

I'm using the nightly snapshot tarball xen-unstable from yesterday.=20
Any ideas what's the problem ?

Regards,

Matthias Hofherr

=2D-=20
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
 Matthias Hofherr             EMail: Matthias_Hofherr@xxxxxxxx
 GeNUA Gesellschaft fuer Netzwerk- und Unix-Administration mbH
 Domagkstra=DFe 7, D-85551 Kirchheim     Tel.+49 (89) 99 19 50-0
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<=20


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