From: Jan Marten Simons <marten@xtal.rwth-aachen.de>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] DMA in Windows 2000/XP/2003
Date: Wed, 24 Aug 2005 14:56:26 +0200 [thread overview]
Message-ID: <430C6E7A.5030803@xtal.rwth-aachen.de> (raw)
In-Reply-To: <BAY110-F260C9D793FDDBE77F89C21B6A90@phx.gbl>
Víctor Córcoles López wrote:
> Hello developers. My English is not good.
>
> I see that DMA in Hard Disks in guest OS Windows 2000/XP/2003 is not
> avalaible, it run in PIO mode.
>
> How can activate UDMA mode for hard disk ?
>
I don't think you'd get any advantage of activating DMA inside the qemu
guest-OS, as qemu has to proxy all rw-access into a file anyway, unless
you pass an actual device/partition to qemu. Besides qemu is emulating
the complete pci bus, which cannot use features of actual hardware in
the machine (e.g. your hdd or features your chipset provide). I guess it
would be possible to emulate uDMA inside the vm, too, but it's likely to
even slowdown the emulation.
So long,
Jan
next prev parent reply other threads:[~2005-08-24 13:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-23 13:28 [Qemu-devel] DMA in Windows 2000/XP/2003 Víctor Córcoles López
2005-08-23 23:47 ` Kazu
2005-08-29 6:56 ` Brad Campbell
2005-08-29 17:10 ` Christian MICHON
2005-08-24 12:56 ` Jan Marten Simons [this message]
2005-08-24 15:03 ` André Braga
2005-08-25 2:23 ` [Qemu-devel] Read/Write to shares on Windows (XP Pro) host from Windows (2000 Adv) guest Francois Rioux
2005-08-25 3:20 ` Jim C. Brown
2005-08-25 4:26 ` John R. Hogerhuis
2005-08-25 6:38 ` [Qemu-devel] Read/Write to shares on Windows (XP Pro) host fromWindows " Kazu
2005-08-25 17:35 ` Francois Rioux
2005-08-25 17:35 ` Francois Rioux
2005-08-25 12:35 ` [Qemu-devel] Read/Write to shares on Windows (XP Pro) host from Windows " Doctor Bill
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