In article <20140826121728.gl23...@homeworld.netbsd.org>, Emmanuel Dreyfus <m...@netbsd.org> wrote: >Hi > >ixgb(4) has poor performances, even on latest -current. Here is the >dmesg output: >ixg1 at pci5 dev 0 function 1: Intel(R) PRO/10GbE PCI-Express Network >Driver, Version - 2.3.10 >ixg1: clearing prefetchable bit >ixg1: interrupting at ioapic0 pin 9 >ixg1: PCI Express Bus: Speed 2.5Gb/s Width x8 > >The interface is configued with: >ifconfig ixg1 mtu 9000 tso4 ip4csum tcp4csum-tx udp4csum-tx > >And sysctl: >kern.sbmax = 67108864 >kern.somaxkva = 67108864 >net.inet.udp.sendspace = 2097152 >net.inet.udp.recvspace = 2097152 >net.inet.tcp.sendspace = 2097152 >net.inet.tcp.recvspace = 2097152 >net.inet.tcp.recvbuf_auto = 0 >net.inet.tcp.sendbuf_auto = 0 > >netperfs shows a maximum performance of 2.3 Gb/s. That let me with >the feeling that only a PCI lane is used. Is it possible? > >I also found this page that tackles the same problem on Linux: >http://dak1n1.com/blog/7-performance-tuning-intel-10gbe > >They tweak the PCI MMRBC. Anyone has an idea of how it could be >done on NetBSD? I thought about borrowing code from src/sys/dec/pci/if_dge.c >but I am not sure what pci_conf_read/pci_conf_write commands should be used. > >Any other idea on how to improve performance?
ftp://ftp.supermicro.com/CDR-C2_1.20_for_Intel_C2_platform/Intel/LAN/v15.5/PROXGB/DOCS/SERVER/prform10.htm#Setting_MMRBC
