On Sat, Oct 5, 2013 at 4:34 AM, Alan Stern st...@rowland.harvard.edu wrote:
On Fri, 4 Oct 2013, Markus Rechberger wrote:
I was only testing reading the data so I didn't see any caching
effects since I don't have a device or driver which I can send a lot
data out.
As far as I understand
On Sat, 5 Oct 2013, Ming Lei wrote:
The buffer should be cached. The userspace program will have to make
sure that it doesn't try to access the buffer while DMA is in progress.
As long as that restriction is obeyed, the USB core will take care of
mapping the buffer for DMA (which flushes
On Sat, Oct 5, 2013 at 11:10 PM, Alan Stern st...@rowland.harvard.edu wrote:
On Sat, 5 Oct 2013, Ming Lei wrote:
The buffer should be cached. The userspace program will have to make
sure that it doesn't try to access the buffer while DMA is in progress.
As long as that restriction is
On Mon, Sep 30, 2013 at 5:12 PM, Markus Rechberger
mrechber...@gmail.com wrote:
On Mon, Sep 30, 2013 at 4:59 PM, Alan Stern st...@rowland.harvard.edu wrote:
On Mon, 30 Sep 2013, Markus Rechberger wrote:
to explain why Isochronous makes such a difference, the kernel driver
doesn't do the
On Sun, 29 Sep 2013, Markus Rechberger wrote:
This patch adds memory mapping support to USBFS for isochronous and bulk
data transfers, it allows to pre-allocate usb transfer buffers.
The CPU usage decreases 1-2% on my 1.3ghz U7300 notebook
The CPU usage decreases 6-8% on an Intel Atom n270
On Fri, Oct 4, 2013 at 8:41 PM, Alan Stern st...@rowland.harvard.edu wrote:
On the whole this seems reasonable. There are a few stylistic things
that could be cleaned up (missing blank lines after variable
declarations, for example, and other checkpatch issues), but they are
minor.
Why do
On Fri, 4 Oct 2013, Markus Rechberger wrote:
The biggest problem is that your proc_alloc_memory() routine doesn't
call usbfs_increase_memory_usage(). Without that, there's nothing to
prevent a user from allocating all the available kernel memory.
only root is supposed to have raw USB
On Fri, Oct 4, 2013 at 10:34 PM, Alan Stern st...@rowland.harvard.edu wrote:
On Fri, 4 Oct 2013, Markus Rechberger wrote:
The biggest problem is that your proc_alloc_memory() routine doesn't
call usbfs_increase_memory_usage(). Without that, there's nothing to
prevent a user from
On Mon, Sep 30, 2013 at 5:51 AM, Marcel Holtmann mar...@holtmann.org wrote:
Hi Markus,
Do you have a userspace test program that we can use to verify that this
does work, and that others can use to run on some different platforms to
verify that this is actually faster?
You will need one of
On Mon, Sep 30, 2013 at 1:26 PM, Markus Rechberger
mrechber...@gmail.com wrote:
On Mon, Sep 30, 2013 at 5:51 AM, Marcel Holtmann mar...@holtmann.org wrote:
Hi Markus,
Do you have a userspace test program that we can use to verify that
this
does work, and that others can use to run on some
On Mon, 30 Sep 2013, Markus Rechberger wrote:
to explain why Isochronous makes such a difference, the kernel driver
doesn't do the memset anymore for each urb packet.
However that patch addresses multiple issues
* Isochronous improvement by removing memset for each packet
* Pre-Allocation to
On Mon, Sep 30, 2013 at 4:59 PM, Alan Stern st...@rowland.harvard.edu wrote:
On Mon, 30 Sep 2013, Markus Rechberger wrote:
to explain why Isochronous makes such a difference, the kernel driver
doesn't do the memset anymore for each urb packet.
However that patch addresses multiple issues
*
This patch adds memory mapping support to USBFS for isochronous and bulk
data transfers, it allows to pre-allocate usb transfer buffers.
The CPU usage decreases 1-2% on my 1.3ghz U7300 notebook
The CPU usage decreases 6-8% on an Intel Atom n270 when
transferring 20mbyte/sec (isochronous), it
On Sun, Sep 29, 2013 at 10:02 PM, Markus Rechberger
mrechber...@gmail.com wrote:
This patch adds memory mapping support to USBFS for isochronous and bulk
data transfers, it allows to pre-allocate usb transfer buffers.
The CPU usage decreases 1-2% on my 1.3ghz U7300 notebook
The CPU usage
On Sun, Sep 29, 2013 at 04:02:56PM +0200, Markus Rechberger wrote:
This patch adds memory mapping support to USBFS for isochronous and bulk
data transfers, it allows to pre-allocate usb transfer buffers.
The CPU usage decreases 1-2% on my 1.3ghz U7300 notebook
The CPU usage decreases 6-8% on
On Sun, Sep 29, 2013 at 5:14 PM, Greg KH gre...@linuxfoundation.org wrote:
On Sun, Sep 29, 2013 at 04:02:56PM +0200, Markus Rechberger wrote:
This patch adds memory mapping support to USBFS for isochronous and bulk
data transfers, it allows to pre-allocate usb transfer buffers.
The CPU usage
On Sun, Sep 29, 2013 at 4:24 PM, Ming Lei tom.leim...@gmail.com wrote:
On Sun, Sep 29, 2013 at 10:02 PM, Markus Rechberger
mrechber...@gmail.com wrote:
This patch adds memory mapping support to USBFS for isochronous and bulk
data transfers, it allows to pre-allocate usb transfer buffers.
The
On Sun, Sep 29, 2013 at 07:32:56PM +0200, Markus Rechberger wrote:
On Sun, Sep 29, 2013 at 5:14 PM, Greg KH gre...@linuxfoundation.org wrote:
On Sun, Sep 29, 2013 at 04:02:56PM +0200, Markus Rechberger wrote:
This patch adds memory mapping support to USBFS for isochronous and bulk
data
On Sun, Sep 29, 2013 at 9:01 PM, Greg KH gre...@linuxfoundation.org wrote:
On Sun, Sep 29, 2013 at 07:32:56PM +0200, Markus Rechberger wrote:
On Sun, Sep 29, 2013 at 5:14 PM, Greg KH gre...@linuxfoundation.org wrote:
On Sun, Sep 29, 2013 at 04:02:56PM +0200, Markus Rechberger wrote:
This
On Sun, 29 Sep 2013, Markus Rechberger wrote:
Do you have a userspace test program that we can use to verify that this
does work, and that others can use to run on some different platforms to
verify that this is actually faster?
You will need one of our devices for testing I
On Sun, Sep 29, 2013 at 9:58 PM, Alan Stern st...@rowland.harvard.edu wrote:
On Sun, 29 Sep 2013, Markus Rechberger wrote:
Do you have a userspace test program that we can use to verify that this
does work, and that others can use to run on some different platforms to
verify that this
Hi Markus,
Do you have a userspace test program that we can use to verify that this
does work, and that others can use to run on some different platforms to
verify that this is actually faster?
You will need one of our devices for testing I guess. Some scanners
(which use USBFS) or other
22 matches
Mail list logo
