* [Qemu-devel] Using OHCI to replace UHCI can improve the USB performance dramatically under windows
@ 2007-08-16 4:57 Steven Hu
0 siblings, 0 replies; only message in thread
From: Steven Hu @ 2007-08-16 4:57 UTC (permalink / raw)
To: xen-users, qemu-devel
Hello, all
Is there anyone interested in the performance of USB under QEMU?
I found that when use OHCI to replace UHCI in qemu, it will improve
the performance of USB storage device. I have tested it, the
performance is almost equal of a real usb device.
The way to do this is making
little change in the file xen-3.1.0-src/tools/ioemu/hw/pc.c .
--- pc.c.original 2007-08-14 14:04:33.000000000 +0800
+++ pc.c 2007-08-08 08:57:33.000000000 +0800
@@ -897,7 +897,9 @@
pci_piix4_acpi_init(pci_bus, piix3_devfn + 2);
if (pci_enabled && usb_enabled) {
- usb_uhci_init(pci_bus, piix3_devfn + (acpi_enabled ? 3 : 2));
+ //usb_uhci_init(pci_bus, piix3_devfn + (acpi_enabled ? 3 : 2));
+ //usb_ohci_init(pci_bus, 3, -1);
+ usb_ohci_init(pci_bus, 3,piix3_devfn + (acpi_enabled ? 3 : 2));
}
#ifndef CONFIG_DM
There are some issues forLinux guest OS. I am trying to fix it. Is
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