Hello, I revamp this thread, as I tested all combinations of cables and duplex mode getting again the problem without any difference. Resuming: after starting a large transfer, I soon get this in /var/log/messages Feb 9 15:40:14 tekkaman kernel: tg3: eth0: Link is down. Feb 9 15:40:14 tekkaman NetworkManager: <info> (eth0): carrier now OFF (device state 8, deferring action for 4 seconds) Feb 9 15:40:16 tekkaman kernel: tg3: eth0: Link is up at 100 Mbps, full duplex. Feb 9 15:40:16 tekkaman kernel: tg3: eth0: Flow control is off for TX and off for RX. Feb 9 15:40:16 tekkaman NetworkManager: <info> (eth0): carrier now ON (device state 8) And also the transfer rate suddenly drops from around 9.7MB/s to 4-5MB/s News: I found this bugzilla below that is about tg3 and the same model as mine. My lspci output: 09:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02) bugzilla entry: https://bugzilla.redhat.com/show_bug.cgi?id=527209 It is closed, but I noticed that applying the temporary workaround (see comments 19 and 21) that was in place before the supposed fix, now I continue to get the off/on for the interface, but at least I can sustain 10.1MB/s during the overall 600MB transfer. My initial (default) setup with card set in auto sense and autonegotiation set up at 100mbit/s [root@tekkaman ~]# ethtool -k eth0 Offload parameters for eth0: Cannot get device flags: Operation not supported rx-checksumming: on tx-checksumming: on scatter-gather: on tcp-segmentation-offload: off udp-fragmentation-offload: off generic-segmentation-offload: on generic-receive-offload: off large-receive-offload: off Workaround: [root@tekkaman ~]# ethtool -K eth0 sg off verify changed settings: [root@tekkaman ~]# ethtool -k eth0 Offload parameters for eth0: Cannot get device flags: Operation not supported rx-checksumming: on tx-checksumming: on scatter-gather: off tcp-segmentation-offload: off udp-fragmentation-offload: off generic-segmentation-offload: on generic-receive-offload: off large-receive-offload: off transfer test: [gcecchi@tekkaman ~]$ time scp Downloads/SS830.2009_0817.103-x64.iso root@mysrv:/root root@mysrv's password: SS830.2009_0817.103-x64.iso 100% 603MB 10.6MB/s 00:57 real 0m59.383s user 0m17.708s sys 0m3.957s After the first 10-20 MBytes transferred I get these in /var/log/messages: Feb 9 15:40:14 tekkaman kernel: tg3: eth0: Link is down. Feb 9 15:40:14 tekkaman NetworkManager: <info> (eth0): carrier now OFF (device state 8, deferring action for 4 seconds) Feb 9 15:40:16 tekkaman kernel: tg3: eth0: Link is up at 100 Mbps, full duplex. Feb 9 15:40:16 tekkaman kernel: tg3: eth0: Flow control is off for TX and off for RX. Feb 9 15:40:16 tekkaman NetworkManager: <info> (eth0): carrier now ON (device state 8) Anyone with this model got this problem again? Possible a regression after the 127 kernel? Before re-opening the bugzilla I would like to share.... Thanks again for comments and input. Gianluca -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
