Your log messages tell the whole story, tso is disabled for 10/100 mb speeds.
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
