[Qemu-devel] USB performance Question

[Qemu-devel] USB performance Question

[admin]

I could get very complicated USB devices to work under Qemu with Windows 
as guest, Linux as host.
This is pretty amazing development and I must congratulate the Qemu 
developers.


The only problem is the USB speed.
I get only about 10kbit/s max!
This is measured by downloading a 1MByte scientific camera image.


Is this the expected USB speed at the moment or is there anything I can 
do to improve speed?

Thanks

Re: [Qemu-devel] USB performance Question

[admin]

Does anyone have a comment about this?
It would be interesting to know where the USB development is going as it 
is extremely promising and the only small obstacle (i.m.o) for full 
feature device access.
The only remaining barrier is speed which should be improved.

I can look at the code if someone can point me to where in the sources 
the USB interface is.

thanks


admin@mmri.us wrote:
> I could get very complicated USB devices to work under Qemu with 
> Windows as guest, Linux as host.
> This is pretty amazing development and I must congratulate the Qemu 
> developers.
>
>
> The only problem is the USB speed.
> I get only about 10kbit/s max!
> This is measured by downloading a 1MByte scientific camera image.
>
>
> Is this the expected USB speed at the moment or is there anything I 
> can do to improve speed?
>
> Thanks
>
>
>
>

Re: [Qemu-devel] USB performance Question

[Arnon Gilboa]

I am in the middle of coding EHCI (USB 2.0) host controller emulation.
It is supposed to support faster device speeds (480 Mbit/sec instead of
USB 1.1 speeds - 1.5 or 12Mbit/sec). I will post it on the list when it
basicly supports simple devices such as disk-on-key. Currently I still
have some major problems with the scheduling of async and periodic frame
lists.

I will check your comment regarding the speed and see what can be done.
Anway, if you want to try to solve the issue yourself, the relevant code
is in usb-linux.c (Linux host USB redirector) and the USB UHCI/OHCI
controller emulations (hw/usb-uhci.c or hw/usb-ohci.c).

-----Original Message-----
From: qemu-devel-bounces+arnong=qumranet.com@nongnu.org
[mailto:qemu-devel-bounces+arnong=qumranet.com@nongnu.org] On Behalf Of
admin@mmri.us
Sent: Sunday, November 25, 2007 3:01 PM
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] USB performance Question

Does anyone have a comment about this?
It would be interesting to know where the USB development is going as it
is extremely promising and the only small obstacle (i.m.o) for full
feature device access.
The only remaining barrier is speed which should be improved.

I can look at the code if someone can point me to where in the sources
the USB interface is.

thanks


admin@mmri.us wrote:
> I could get very complicated USB devices to work under Qemu with 
> Windows as guest, Linux as host.
> This is pretty amazing development and I must congratulate the Qemu 
> developers.
>
>
> The only problem is the USB speed.
> I get only about 10kbit/s max!
> This is measured by downloading a 1MByte scientific camera image.
>
>
> Is this the expected USB speed at the moment or is there anything I 
> can do to improve speed?
>
> Thanks
>
>
>
>

Re: [Qemu-devel] USB performance Question

[admin]

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RE: [Qemu-devel] USB performance Question

[Arnon Gilboa]

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I have just copied 138 MByte (800 files) from a disk-on-key in 75 sec.
This is ~14.7Mbit/s, which is more than USB 1.1 full-speed. I have
checked it using KVM and WinXP guest. With QEMU only (-no-kvm), it took
130 sec, which is ~8.5 Mbit/sec.
If you can give some info about your USB device (configurations,
interfaces, endpoints etc.) and the transfers (isochronous? bulk?) , it
would help in solving this issue. 
________________________________

From: qemu-devel-bounces+arnong=qumranet.com@nongnu.org
[mailto:qemu-devel-bounces+arnong=qumranet.com@nongnu.org] On Behalf Of
admin@mmri.us
Sent: Sunday, November 25, 2007 5:54 PM
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] USB performance Question


Thanks Arnon.

USB1 works really great even for complex streaming cameras!
Although it is just very very slow.
As mentioned I only get about 10kbit/s! which is something I dont
understand why.
I would have expected 1Mbit/s and could live with that.

If there are any test you want me to do please dont hesitate.

Cant wait for your USB2 implementation.
Great effort!




Arnon Gilboa wrote: 

	I am in the middle of coding EHCI (USB 2.0) host controller
emulation.
	It is supposed to support faster device speeds (480 Mbit/sec
instead of
	USB 1.1 speeds - 1.5 or 12Mbit/sec). I will post it on the list
when it
	basicly supports simple devices such as disk-on-key. Currently I
still
	have some major problems with the scheduling of async and
periodic frame
	lists.
	
	I will check your comment regarding the speed and see what can
be done.
	Anway, if you want to try to solve the issue yourself, the
relevant code
	is in usb-linux.c (Linux host USB redirector) and the USB
UHCI/OHCI
	controller emulations (hw/usb-uhci.c or hw/usb-ohci.c).
	
	-----Original Message-----
	From: qemu-devel-bounces+arnong=qumranet.com@nongnu.org
	[mailto:qemu-devel-bounces+arnong=qumranet.com@nongnu.org] On
Behalf Of
	admin@mmri.us
	Sent: Sunday, November 25, 2007 3:01 PM
	To: qemu-devel@nongnu.org
	Subject: Re: [Qemu-devel] USB performance Question
	
	Does anyone have a comment about this?
	It would be interesting to know where the USB development is
going as it
	is extremely promising and the only small obstacle (i.m.o) for
full
	feature device access.
	The only remaining barrier is speed which should be improved.
	
	I can look at the code if someone can point me to where in the
sources
	the USB interface is.
	
	thanks
	
	
	admin@mmri.us wrote:
	  

		I could get very complicated USB devices to work under
Qemu with 
		Windows as guest, Linux as host.
		This is pretty amazing development and I must
congratulate the Qemu 
		developers.
		
		
		The only problem is the USB speed.
		I get only about 10kbit/s max!
		This is measured by downloading a 1MByte scientific
camera image.
		
		
		Is this the expected USB speed at the moment or is there
anything I 
		can do to improve speed?
		
		Thanks
		
		
		
		
		    

	
	
	
	
	
	
	
	  



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Re: [Qemu-devel] USB performance Question

[admin]

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