On Thu, Mar 19, 2015 at 11:36:29AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote: > On 09:19 Thu 19 Mar , Peter Chen wrote: > > Hi all, > > > > In this patch set, I add some interfaces for tuning the performance > > of chipidea usb driver. With this set, the USB performance can be improved > > at some user cases with suitable parameters. The main changes: > > > > - Interface to tune interrupt threshold control, and set > > 'Immediate' for default value > > - The glue layer can disable stream mode according to USB role > > - Interface to tune AHB burst configuration at SBUSCFG > > - Interface to tune tx/rx burst size > > - i.mx changes for achieving better performance, it can reduce > > the latecy between bus and USB FIFO, and reduce the overrun > > and underrun occurrences, it is useful for the system bus is busy. > > we see great improvement for ISO transfer, eg, high resolution > > USB camera when the bus is busy. > > > > Below are some test results at imx6sx sdb board > > (set ehci_hcd.park=3 at bootargs), the tests are done > > at v4.0 kernel, no other bus loading during the tests, > > so we have not seen performance change for some use cases. > > > > USB Mass Storage (Host mode) > > With Patch Set Without Patch Set > > R: 26.9 MB/s 27 MB/s > > W: 25.2 MB/s 24.5 MB/s > > > > 1G USB Ethernet Card > > With Patch Set Without Patch Set > > TX: 186 Mb/s 185 Mb/s > > RX: 219 Mb/s 216 Mb/s > > > > g_ncm (Device Mode) > > With Patch Set Without Patch Set > > TX: 166MB/s 163MB/s > > RX: 230MB/s 184MB/s > > The improve is not drag sticks except for gcm RX > > The most interesting path will be on full system loaded > Yeah, I can have a try. But we have no GPU driver and related apps on it, I am not sure if I can create starve bus situation. Any high bus loading tools suggest? -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
