Ok. I use 2 em2840-based usb sticks (em28xx driver) attached to a Marvell Kirkwood-SoC with a orion-ehci usb controller. These usb sticks stream dvb data (digital TV) employing isochronous usb transfers (user application is vdr). Starting from linux-3.6 I see ERROR: 1024 KiB atomic DMA coherent pool is too small! in the syslog after several 10 minutes (sometimes hours) of streaming and then streaming stops.
Hi, this is not limited to the em28xx driver. I am using two TechnoTrend AG TT-connect S2-3600 DVB-S2 devices with the Kirwood plaform and i see the same behavior with all kernel version above 3.5.7. The driver for the S2-3600 devices is pctv452e. On a second kirwood with two Dexatek DVB-T devices (driver rtl28xxu) the above mentioned error doesn't occur. Kernel version up to 3.8 work without a problem with the Dexatek devices. Bernd -- 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
