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cs8900a seems to be missing frames


Target mpc555, ec555 board

Apparently, during gdb downloads, my ethernet controller (cs8900a) drops
(or does not see) a lot of frames, resulting in retransmits and overall
poor performance and sometimes even complete lockup. The ethereal trace
below explains why I think frames are dropped. Anybody ever experienced
something similar ? Any known workarounds ?

Thanks in advance,

Bob


   1177 5.064851    192.168.1.2           192.168.246.3         TCP     
32791 > 9000 [PSH, ACK] Seq=37645 Ack=2220 Win=955008 Len=1
   1178 5.064971    192.168.1.2           192.168.246.3         TCP     
32791 > 9000 [PSH, ACK] Seq=37646 Ack=2220 Win=955008 Len=537
   1179 5.066694    192.168.246.3         192.168.1.2           TCP     
9000 > 32791 [ACK] Seq=2220 Ack=37646 Win=1472 Len=0
   1180 5.067084    192.168.246.3         192.168.1.2           TCP     
9000 > 32791 [ACK] Seq=2220 Ack=38183 Win=1472 Len=0
   1181 5.081555    192.168.246.3         192.168.1.2           TCP     
9000 > 32791 [PSH, ACK] Seq=2220 Ack=38183 Win=1472 Len=7
   1182 5.081738    192.168.1.2           192.168.246.3         TCP     
32791 > 9000 [PSH, ACK] Seq=38183 Ack=2227 Win=955008 Len=1
   1183 5.081834    192.168.1.2           192.168.246.3         TCP     
32791 > 9000 [PSH, ACK] Seq=38184 Ack=2227 Win=955008 Len=540
   1184 5.083583    192.168.246.3         192.168.1.2           TCP     
9000 > 32791 [ACK] Seq=2227 Ack=38184 Win=1472 Len=0
   1185 5.284929    192.168.1.2           192.168.246.3         TCP     
[TCP Retransmission] 32791 > 9000 [PSH, ACK] Seq=38184 Ack=2227
Win=955008 Len=540
   1186 5.286557    192.168.246.3         192.168.1.2           TCP     
9000 > 32791 [ACK] Seq=2227 Ack=38724 Win=1472 Len=0
   1187 5.300227    192.168.246.3         192.168.1.2           TCP     
9000 > 32791 [PSH, ACK] Seq=2227 Ack=38724 Win=1472 Len=7
   1188 5.300457    192.168.1.2           192.168.246.3         TCP     
32791 > 9000 [PSH, ACK] Seq=38724 Ack=2234 Win=955008 Len=1
   1189 5.300556    192.168.1.2           192.168.246.3         TCP     
32791 > 9000 [PSH, ACK] Seq=38725 Ack=2234 Win=955008 Len=547
   1190 5.302257    192.168.246.3         192.168.1.2           TCP     
9000 > 32791 [ACK] Seq=2234 Ack=38725 Win=1472 Len=0
   1191 5.302651    192.168.246.3         192.168.1.2           TCP     
9000 > 32791 [ACK] Seq=2234 Ack=39272 Win=1472 Len=0
   1192 5.317231    192.168.246.3         192.168.1.2           TCP     
9000 > 32791 [PSH, ACK] Seq=2234 Ack=39272 Win=1472 Len=7
   1193 5.317451    192.168.1.2           192.168.246.3         TCP     
32791 > 9000 [PSH, ACK] Seq=39272 Ack=2241 Win=955008 Len=1



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