On 12/20/2012 10:17 AM, Erwin Rol : > Hallo Nicolas, > > On 6-12-2012 14:27, Nicolas Ferre wrote: >> Erwin, >> >> On 12/06/2012 12:32 PM, Erwin Rol : >>> Hello Nicolas, Havard, all, >>> >>> I have a very obscure problem with a at91sam9260 board (almost 1 to 1 >>> copy of the Atmel EK). >>> >>> The MACB seems to stall when I use large (>2 * MTU) UDP datagrams. The >>> test case is that a udp echo client (PC) sends datagrams with increasing >>> length to the AT91 until the max length of the UDP datagram is reached. >>> When there is no IP fragmentation everything is fine, but when the >>> datagrams are starting to get fragmented the AT91 will not reply >>> anymore. But as soon as some network traffic happens it goes on again, >>> and non of the data is lost. > > <snip> > >>> I tried several kernels including the test version from Nicolas that he >>> posted on LKML in October. They all show the same effect. >> >> [..] >> >> It seems that Matteo has the same behavior: check here: >> http://www.spinics.net/lists/netdev/msg218951.html > > I tried Matteo's patch and it seems to work. But I don't know if the > patch is really the right solution. I checked again with wireshark and > it really seems the sending that stalls not the receiving. But as soon > as a ethernet frame is received the sending "un-stalls". So maybe the > patch just causes an MACB IRQ at certain moments that causes the sending > to continue?
Any digging is interesting for me. >> I am working on the macb driver right now, so I will try to reproduce >> and track this issue on my side. > > Any luck reproducing it ? Yes, I see unexpected things happening but as I am connected to a whole company network so maybe some broadcast packets are unlocking the interface... Anyway, I am continuing to investigate. Best regards,-- Nicolas Ferre -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
