Date: Tue, 1 Oct 2002 07:53:59 UT From: ertank@ozlerplastik.com To: freebsd-questions@freebsd.org Subject: Bad checksums on NIC packests Message-ID: <200210010753.DAA07189@www51.rapidsite.net>
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Hello, I have a FreeBSD 4.6-STABLE system. 256MB RAM. My NIC is 3C905b-tx. My kernel includes only this nic driver compiled in. Hardware is 200mmx, IDE disk system. My switch is 10/100 and non-managable. My problem was first slow samba performance. After I tried ftp upload and download. I see that my download speeds are reasonable but not fast enough. And, don't mention about uploads. 40kb/sec average. I decided to tcpdump during my upload and downloads. My command line was: "tcpdump -i xl0 -l -vv" I myself do not understand this type of outputs usually. But, one thing is very interesting that there is a lot of bad checksum errors. So, I decided to post it to the list for somebody's advice. I do not think the problem is ethernet card. My subsustem is completely 3c905b or c class NICs. I can copy 650mb over ms network really very fast. Also, I do not think this is because of bad cabling. As I said above I have fast speeds. And, I changed this cable time to time for another reasons. I just want to ask where should I look? What should I change? I read about complains about 3c905 NICs. On the other hand I read very proudy words about that NICs, too. Here is some part of my ftp upload dump. There are bad checksum messages during download, but not that much. If anyone interests. I can post the complete dumps seperately. Two files are 200kb in tarred gzipped format. Thanks in advance. 08:59:40.863211 ertank.1700 > ozlerplastik.com.telnet: . [tcp sum ok] 2115353:2115353(0) ack 3548812291 win 64773 (DF) (ttl 128, id 20291, len 40) 08:59:40.863411 ozlerplastik.com.telnet > ertank.1700: P [bad tcp cksum a310!] 1:28(27) ack 0 win 65535 (DF) [tos 0x10] (ttl 64, id 57149, len 67, bad cksum 0!) 08:59:40.929785 ozlerplastik.com.squid > halil.1170: P 50714828:50716276(1448) ack 1080811 win 65535 (DF) (ttl 64, id 57151, len 1488, bad cksum 0!) 08:59:41.032874 ozlerplastik.com.squid > halil.1170: P 1448:2896(1448) ack 1 win 65535 (DF) (ttl 64, id 57153, len 1488, bad cksum 0!) 08:59:41.033360 halil.1170 > ozlerplastik.com.squid: . [tcp sum ok] 1:1(0) ack 2896 win 8760 (DF) (ttl 128, id 35588, len 40) 08:59:41.073165 ertank.1700 > ozlerplastik.com.telnet: . [tcp sum ok] 0:0(0) ack 28 win 64746 (DF) (ttl 128, id 20547, len 40) 08:59:41.345335 halil.1170 > ozlerplastik.com.squid: F [tcp sum ok] 1:1(0) ack 6769 win 7783 (DF) (ttl 128, id 36100, len 40) 08:59:41.345468 ozlerplastik.com.squid > halil.1170: . [bad tcp cksum db27!] 6769:6769(0) ack 2 win 65535 (DF) (ttl 64, id 57160, len 40, bad cksum 0!) 08:59:41.345814 ozlerplastik.com.squid > halil.1170: F [bad tcp cksum da27!] 6769:6769(0) ack 2 win 65535 (DF) (ttl 64, id 57161, len 40, bad cksum 0!) 08:59:41.346002 halil.1170 > ozlerplastik.com.squid: . [tcp sum ok] 2:2(0) ack 6770 win 7783 (DF) (ttl 128, id 36356, len 40) 08:59:41.351478 64.12.25.28.aol > halil.1072: . [tcp sum ok] 1363979447:1363979447(0) ack 506585 win 16384 (DF) (ttl 43, id 24233, len 40, bad cksum 0!) 08:59:41.351654 halil.1072 > 64.12.25.28.aol: . [tcp sum ok] 1:1(0) ack 1 win 8186 (DF) (ttl 128, id 36612, len 40) 08:59:43.163120 11aec257.00:50:8b:8b:9f:f3.9001 > 0.ff:ff:ff:ff:ff:ff.9001: ipx-#9001 43 08:59:44.261756 11aec257.00:50:8b:8b:9f:f3.9001 > 0.ff:ff:ff:ff:ff:ff.9001: ipx-#9001 99 08:59:44.261774 4c574182.00:50:8b:8b:9f:f3.9001 > 0.ff:ff:ff:ff:ff:ff.9001: ipx-#9001 99 08:59:44.828932 4c574182.00:00:21:4e:89:e8.553 > 70001600.88:09:65:04:70:00.553: ipx-nwlink-dgm 197 08:59:45.319779 ertank.1075 > ozlerplastik.com.ftp: S [tcp sum ok] 77680920:77680920(0) win 65535 <mss 1460,nop,nop,sackOK> (DF) (ttl 128, id 26179, len 48) 08:59:45.319974 ozlerplastik.com.ftp > ertank.1075: S [bad tcp cksum e914!] 1215290833:1215290833(0) ack 77680921 win 65535 <mss 1460> (ttl 64, id 57163, len 44, bad cksum 0!) 08:59:45.320118 ertank.1075 > ozlerplastik.com.ftp: . [tcp sum ok] 1:1(0) ack 1 win 65535 (DF) (ttl 128, id 26435, len 40) 08:59:45.353331 ozlerplastik.com.ftp > ertank.1075: P 1:52(51) ack 1 win 65535 (DF) (ttl 64, id 57164, len 91, bad cksum 0!) 08:59:45.525091 4c574182.00:50:8b:8b:9f:f3.9001 > 0.ff:ff:ff:ff:ff:ff.9001: ipx-#9001 43 08:59:45.532519 ertank.1075 > ozlerplastik.com.ftp: . [tcp sum ok] 1:1(0) ack 52 win 65484 (DF) (ttl 128, id 26691, len 40) 08:59:46.818751 ertank.1075 > ozlerplastik.com.ftp: P [tcp sum ok] 1:11(10) ack 52 win 65484 (DF) (ttl 128, id 26947, len 50) 08:59:46.819211 ozlerplastik.com.ftp > ertank.1075: P [bad tcp cksum ffe4!] 52:86(34) ack 11 win 65535 (DF) (ttl 64, id 57165, len 74, bad cksum 0!) 08:59:46.937788 ertank.1075 > ozlerplastik.com.ftp: . [tcp sum ok] 11:11(0) ack 86 win 65450 (DF) (ttl 128, id 27203, len 40) 08:59:47.694187 ozlerplastik.com.gds_db > zeynep.1066: P [bad tcp cksum c72f!] 1280308047:1280308051(4) ack 2174202 win 65535 (DF) (ttl 64, id 57166, len 44, bad cksum 0!) 08:59:47.834264 zeynep.1066 > ozlerplastik.com.gds_db: . [tcp sum ok] 1:1(0) ack 4 win 8456 (DF) (ttl 128, id 32260, len 40) 08:59:48.640388 ertank.1075 > ozlerplastik.com.ftp: P [tcp sum ok] 11:19(8) ack 86 win 65450 (DF) (ttl 128, id 27459, len 48) 08:59:48.654147 ozlerplastik.com.ftp > ertank.1075: P [bad tcp cksum c4c7!] 86:119(33) ack 19 win 65535 (DF) (ttl 64, id 57167, len 73, bad cksum 0!) 08:59:48.757299 ertank.1075 > ozlerplastik.com.ftp: . [tcp sum ok] 19:19(0) ack 119 win 65417 (DF) (ttl 128, id 27715, len 40) 08:59:48.788263 192.168.0.8.1027 > ozlerplastik.com.squid: P 983246:983580(334) ack 1754360577 win 8440 (DF) (ttl 128, id 17924, len 374) 08:59:48.887899 ozlerplastik.com.squid > 192.168.0.8.1027: . [bad tcp cksum dc7!] 1:1(0) ack 334 win 65535 (DF) (ttl 64, id 57169, len 40, bad cksum 0!) 08:59:51.322065 ozlerplastik.com.squid > 192.168.0.8.1027: P 1:323(322) ack 334 win 65535 (DF) (ttl 64, id 57173, len 362, bad cksum 0!) 08:59:51.488008 192.168.0.8.1027 > ozlerplastik.com.squid: . [tcp sum ok] 334:334(0) ack 323 win 8118 (DF) (ttl 128, id 18180, len 40) 08:59:51.732216 11aec257.00:50:8b:8b:9f:f3.9001 > 0.ff:ff:ff:ff:ff:ff.9001: ipx-#9001 43 08:59:51.960121 ertank.1075 > ozlerplastik.com.ftp: P [tcp sum ok] 19:33(14) ack 119 win 65417 (DF) (ttl 128, id 27971, len 54) 08:59:51.960789 ozlerplastik.com.ftp > ertank.1075: P [bad tcp cksum 60a0!] 119:156(37) ack 33 win 65535 (DF) (ttl 64, id 57177, len 77, bad cksum 0!) 08:59:52.072001 ertank.1075 > ozlerplastik.com.ftp: . [tcp sum ok] 33:33(0) ack 156 win 65380 (DF) (ttl 128, id 28227, len 40) 08:59:52.261867 ozlerplastik.com.netbios-ssn > ertank.2280: P [bad tcp cksum 6659!] 1286427085:1286427089(4) ack 29893826 win 65535 >>> NBT Packet NBT Session Keepalive Flags=0x85000000 (DF) (ttl 64, id 57178, len 44, bad cksum 0!) 08:59:52.372001 ertank.2280 > ozlerplastik.com.netbios-ssn: . [tcp sum ok] 1:1(0) ack 4 win 64259 (DF) (ttl 128, id 28483, len 40) 08:59:53.819539 4c574182.00:50:8b:8b:9f:f3.9001 > 0.ff:ff:ff:ff:ff:ff.9001: ipx-#9001 43 08:59:56.269555 ertank.1075 > ozlerplastik.com.ftp: P [tcp sum ok] 33:57(24) ack 156 win 65380 (DF) (ttl 128, id 34115, len 64) 08:59:56.270107 ozlerplastik.com.ftp > ertank.1075: P 156:207(51) ack 57 win 65535 (DF) (ttl 64, id 57179, len 91, bad cksum 0!) 08:59:56.273676 ertank.1075 > ozlerplastik.com.ftp: P [tcp sum ok] 57:72(15) ack 207 win 65329 (DF) (ttl 128, id 34371, len 55) 08:59:56.275677 ozlerplastik.com.ftp-data > ertank.1079: S [bad tcp cksum bf1a!] 2675928684:2675928684(0) win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 252316685 0> (DF) (ttl 64, id 57180, len 60, bad cksum 0!) 08:59:56.275928 ertank.1079 > ozlerplastik.com.ftp-data: S [tcp sum ok] 77691877:77691877(0) ack 2675928685 win 65535 <mss 1460> (DF) (ttl 128, id 34627, len 44) 08:59:56.276057 ozlerplastik.com.ftp-data > ertank.1079: . [bad tcp cksum 2f1a!] 1:1(0) ack 1 win 65535 (DF) (ttl 64, id 57181, len 40, bad cksum 0!) 08:59:56.276472 ozlerplastik.com.ftp > ertank.1075: P 207:256(49) ack 72 win 65535 (DF) (ttl 64, id 57182, len 89, bad cksum 0!) 08:59:56.287675 ertank.1079 > ozlerplastik.com.ftp-data: . 1:1461(1460) ack 1 win 65535 (DF) (ttl 128, id 34883, len 1500) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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