Igor, Can you clear a few thigns up for me.
First in your tests below is hostA the server or client? I would assume it is the client but I just want to make certain. Second what is the mtu for the e1000 adapter? Based on the tcpdump for Client you have listed for client in test2 I am not seeing any fragmentation being done on the client in your example. Thanks, Alex Igor Smolyar wrote: > Hi Alexander, > > fix indeed solve crash problem (in vanilla 2.6.28.2) - thank you very > much. But now I have another problem. > When mtu <= 1000 I can not receive packets bigger that 1000. With mtu > 1050 and bigger, fragmentation is working correct. > > hostA ------(e1000)_gateway_(igb)----hostB > 10.48.201.201 10.48.0.254 > > > ------------------------------------------------------------- > Sending one ping of size 1500 from host A to hostB is working when > mtu on igb NIC is 1050 or bigger. > Test1: > Ping on client is OK, no packet loss. > Tcpdump on server: > 10.48.201.201 > 10.48.0.254: icmp: echo request (frag 63563:1...@0+) > (ttl 63, len 1044) > 10.48.201.201 > 10.48.0.254: icmp (frag 63563:4...@1024+) (ttl 63, len > 476) > 10.48.201.201 > 10.48.0.254: icmp (frag 63563:2...@1480) (ttl 63, len > 48) > 10.48.0.254 > 10.48.201.201: icmp: echo reply (frag 59125:1...@0+) > (ttl 64, len 1500) > 10.48.0.254 > 10.48.201.201: icmp (frag 59125:2...@1480) (ttl 64, len > 48) > > On igb NIC: > mtu 1050, rx_buffer_len=2048 > rx_errors: 0 > rx_length_errors: 0 > rx_long_length_errors: 0 > > ------------------------------------------------------------- > > Test2 - received reply packet dropped by igb NIC. > Sending one ping of size 1500 from host A to hostB is not working when > mtu on igb NIC is 1000 or less. > > Client ping statistics: > 1 packets transmitted, 0 received, 100% packet loss, time 0ms > > Tcpdump on client: > IP (tos 0x0, ttl 64, id 65483, offset 0, flags [+], proto 1, length: > 1500) 10.48.201.201 > 10.48.0.254: icmp 1480: echo req uest seq 0 > IP (tos 0x0, ttl 64, id 65483, offset 1480, flags [none], proto 1, > length: 48) 10.48.201.201 > 10.48.0.254: icmp > IP (tos 0x0, ttl 63, id 27391, offset 1480, flags [none], proto 1, > length: 48) 10.48.0.254 > 10.48.201.201: icmp > > Tcpdump on server: > 10.48.201.201 > 10.48.0.254: icmp: echo request (frag 65483:8...@0+) > (ttl 63, len 900) > 10.48.201.201 > 10.48.0.254: icmp (frag 65483:6...@880+) (ttl 63, len > 620) > 10.48.201.201 > 10.48.0.254: icmp (frag 65483:2...@1480) (ttl 63, len > 48) > 10.48.0.254 > 10.48.201.201: icmp: echo reply (frag 27391:1...@0+) > (ttl 64, len 1500) > 10.48.0.254 > 10.48.201.201: icmp (frag 27391:2...@1480) (ttl 64, len > 48) > > In igb NIC: > mtu 900 rx_buffer_len=1024 > rx_errors: 2 > rx_length_errors: 2 > rx_long_length_errors: 2 > > # ethregs -s 0000:09:00.0 | grep RCTL > RCTL 04058022 > SRRCTL(0) 02000000 > SRRCTL(1) 80000400 > SRRCTL(2) 80000400 > SRRCTL(3) 80000400 > > > Thanks for your help and fast response, > Igor. ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel
