Brandeburg, Jesse wrote, at 04/22/2010 11:52 PM: > Your log messages tell the whole story, tso is disabled for 10/100 mb > speeds.
I see. Do you noticed that for two same 82571EB Gigabit NIC, one(eth0) is identified to 1000Mb/s, and the other one(eth1) is identified to 100Mb/s. why? Why do I think they are same? Because from lspci messages, they are all 82571EB. And they all used e1000e driver. If i miss something, please tell me. Thanks ---- Shan Wei > > If you wish you can reenable it with ethtool. > > Tso provides little to no CPU reduction benefit to the slower link > speeds and in fact will hurt bidirectional performance. > > -- > Jesse Brandeburg's iPhone > > On Apr 22, 2010, at 2:30 AM, "Shan Wei" <[email protected]> wrote: > >> There are two same NICes, the setting of TSO is different >> on Fedora13alpha with kernel 2.6.34-rc5-git >> (HEAD:1ef6ce7a340f9ed139a73147ff9cf7ad56889414). >> >> *Phenomenon*： >> (other setting are same, only tso is different) >> >> [r...@rhel ~]# ethtool -k eth0 >> tcp-segmentation-offload: *on* >> >> [r...@rhel ~]# ethtool -k eth1 >> tcp-segmentation-offload: *off* >> >> >> Is this a bug? Or does other reasons cause this? >> >> >> >> *Other Reference Info*： >> 1.dmesg >> e1000e 0000:0b:00.0: irq 59 for MSI/MSI-X >> >> ADDRCONF(NETDEV_UP): eth0: link is not ready >> e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX >> ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready >> >> ADDRCONF(NETDEV_UP): eth1: link is not ready >> e1000e: eth1 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX >> 0000:0b:00.1: eth1: 10/100 speed: disabling TSO >> ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready >> >> 2. [r...@rhel ~]# lspci >> 0b:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit >> Ethernet Controller (rev 06) >> 0b:00.1 Ethernet controller: Intel Corporation 82571EB Gigabit >> Ethernet Controller (rev 06) >> >> 3. [r...@rhel ~]# find /sys/bus/pci/drivers/ -name *0b:00.0* >> /sys/bus/pci/drivers/e1000e/0000:0b:00.0 >> [r...@rhel ~]# find /sys/bus/pci/drivers/ -name *0b:00.1* >> /sys/bus/pci/drivers/e1000e/0000:0b:00.1 >> >> >> >> >> --- >> --- >> --- >> --------------------------------------------------------------------- >> _______________________________________________ >> E1000-devel mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/e1000-devel >> To learn more about Intel® Ethernet, visit >> http://communities.intel.com/community/wired ------------------------------------------------------------------------------ _______________________________________________ E1000-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
