From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kay Sievers Date: Tue, 01 Feb 2005 22:33:39 +0000 Subject: Re: hotplug/usb.agent consumes all CPU Message-Id: <1107297219.21669.21.camel@localhost.localdomain> List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-hotplug@vger.kernel.org On Tue, 2005-02-01 at 16:22 -0500, Simon Wu wrote: > Hello, > > I am using udev with hotplug on kernel 2.6.5 and 2.6.9 (Fedora2 and 3). When I > plug one single cdc_acm device (Nokia wireless cellphones/modem) into > the USB port, dozens of hotplug usb.agent processes invoked and took > away all CPU for 7 to 8 seconds. During this time, the computer > doesn't even accept keyboard input. > > If I plug N Nokia phones in the USB ports at the same time, there seem > to have N times of usb.agent processes and Nx7 seconds delay. > > Any way to improve it? How can you be sure, that the hotplug processes are taking your cpu and that it's not the kernel with the cdc_acm driver that blocks? Are you using other USB devices on the system? Any chance to try maybe a storage device on the same port, if that works as expected? It would be nice to know if you get the same behavior with a 2.6.10 kernel, if you can get one for your system. Thanks, Kay ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl _______________________________________________ Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net Linux-hotplug-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel