On Thu, Jan 01, 2015 at 09:04:22PM +0100, Robert Jarzmik wrote: > As the SMC1111 has a shared pool of 2k memory buckets for both > transmission and reception, and as there are variants which have as few > as 4 buckets in total, the memory pool can be hogged by unclaimed > receptions, and impeed any further transmission. > > This happens on the zylonite pxa board, where 4 packets, most probably > icmp and arp, fill the 4 buckets, preventing any further ethernet > transmission, and stalling the driver. > > The fix is rather rough : whenever all the buckets are filled by > reception packets, and if a transmission is required, the transmission > code path will empty up all received packets. I don't know the hardware (not anymore, fortunately ;), but isn't it possible to dedicate one bucket for transmitting only, so that it will never be occupied by a received packet? Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
