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xen-devel
Re: [Xen-devel] Problems with DMA in xen0
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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> Use IT products in your business? Tell us what you think of them. Give us
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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
-------------------------------------------------------
This SF.net email is sponsored by: IT Product Guide on ITManagersJournal
Use IT products in your business? Tell us what you think of them. Give us
Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more
http://productguide.itmanagersjournal.com/guidepromo.tmpl
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/xen-devel
-------------------------------------------------------
This SF.net email is sponsored by: IT Product Guide on ITManagersJournal
Use IT products in your business? Tell us what you think of them. Give us
Your Opinions, Get Free ThinkGeek Gift Certificates! Click to find out more
http://productguide.itmanagersjournal.com/guidepromo.tmpl
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/xen-devel
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