[PATCH][VT] Enable multi-word DMA mode 2 for the PIIX3 chipset

[PATCH][VT] Enable multi-word DMA mode 2 for the PIIX3 chipset

[Arun Sharma]

Enable multi-word DMA mode 2 for the PIIX3 chipset

Without this patch, Linux PIIX3 driver would see ultra DMA and get confused
and ended up disabling DMA.

With the patch, we're able to see 3x increase in disk read throughput.

Signed-off-by: Winston Wang <winston.l.wang@intel.com>
Signed-off-by: Arun Sharma <arun.sharma@intel.com>

diff -r 29aab159846c -r b5196e075602 tools/ioemu/hw/ide.c
--- a/tools/ioemu/hw/ide.c	Mon Aug 15 18:32:29 2005
+++ b/tools/ioemu/hw/ide.c	Mon Aug 15 20:28:07 2005
@@ -430,6 +430,7 @@
         put_le16(p + 59, 0x100 | s->mult_sectors);
     put_le16(p + 60, s->nb_sectors);
     put_le16(p + 61, s->nb_sectors >> 16);
+    put_le16(p + 63, 0x07);
     put_le16(p + 80, (1 << 1) | (1 << 2));
     put_le16(p + 82, (1 << 14));
     put_le16(p + 83, (1 << 14));
@@ -460,7 +461,7 @@
     put_le16(p + 48, 1); /* dword I/O (XXX: should not be set on CDROM) */
     put_le16(p + 49, 1 << 9); /* LBA supported, no DMA */
     put_le16(p + 53, 3); /* words 64-70, 54-58 valid */
-    put_le16(p + 63, 0x103); /* DMA modes XXX: may be incorrect */
+    put_le16(p + 63, 0x07); /* Multi-word DMA mode 2 */ 
     put_le16(p + 64, 1); /* PIO modes */
     put_le16(p + 65, 0xb4); /* minimum DMA multiword tx cycle time */
     put_le16(p + 66, 0xb4); /* recommended DMA multiword tx cycle time */

[PATCH][VT] Enable multi-word DMA mode 2 for the PIIX3 chipset

[Wang, Winston L]

Clear device_model_pid when vmx guest shutdown failed.
Without the patch, Installation of guest os Windows XP,Windows 2003 will
be failed and also can not shut down vmx guest os correctly.

Signed-off-by: Winston Wang <winston.l.wang@intel.com>

--- tools/python/xen/xend/XendDomainInfo.py.org 2005-10-05
13:45:16.034679872 -0700
+++ tools/python/xen/xend/XendDomainInfo.py     2005-10-05
13:46:52.309043944 -0700
@@ -1089,6 +1089,7 @@

         if self.image:
             try:
+               self.device_model_pid = 0
                 self.image.destroy()
             except:
                 log.exception(

Re: [PATCH][VT] Enable multi-word DMA mode 2 for the PIIX3 chipset

[Keir Fraser]

On 5 Oct 2005, at 21:51, Wang, Winston L wrote:

> Clear device_model_pid when vmx guest shutdown failed.
> Without the patch, Installation of guest os Windows XP,Windows 2003 
> will
> be failed and also can not shut down vmx guest os correctly.

I don't see that variable referenced anywhere in the python tools!

And the email subject line in no way matches the patch.

  -- Keir

RE: [PATCH][VT] Enable multi-word DMA mode 2 for the PIIX3 chipset

[Wang, Winston L]

Sorry, please discard it for now and I need retest the againest the
latest code,
Thanks,
Wang, Winston L wrote:
> Clear device_model_pid when vmx guest shutdown failed.
> Without the patch, Installation of guest os Windows XP,Windows 2003
> will be failed and also can not shut down vmx guest os correctly. 
> 
> Signed-off-by: Winston Wang <winston.l.wang@intel.com>
> 
> --- tools/python/xen/xend/XendDomainInfo.py.org 2005-10-05
> 13:45:16.034679872 -0700 +++ tools/python/xen/xend/XendDomainInfo.py 
> 2005-10-05 13:46:52.309043944 -0700 @@ -1089,6 +1089,7 @@
> 
>          if self.image:
>              try:
> +               self.device_model_pid = 0
>                  self.image.destroy()
>              except:
>                  log.exception(