On Thu, 2006-10-12 at 12:33 -0700, Open Source wrote: > I am using a device that submits URBs asynchronously using the libusb > devio infrastructure. In version 2.6.12 I am able to submit and reap > URBs for my particular application at a transaction rate of one per > millisecond. A transaction consists of a single WRITE URB (< 512 > bytes) followed by a single READ URB (1024 bytes). Once I upgrade to > version 2.6.13, the transactional rate drops to one per 4 > milliseconds!
The kernel's internal tick rate was lowered from 1000Hz to 250Hz starting with 2.6.13. Rebuild with CONFIG_HZ=1000 and the performance should return to normal. Lee ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
