Hi, On Wed, Aug 24, 2016 at 06:29:49PM -0700, Ed Swierk wrote: > I'm trying to migrate from the Octeon SDK to a vanilla Linux 4.4 > kernel for a Cavium OCTEON II (CN6880) board running in 64-bit > little-endian mode. So far I've gotten most of the hardware features I > need working, including XAUI/RXAUI, USB, boot bus and I2C, with a > fairly small set of patches. > https://github.com/skyportsystems/linux/compare/master...octeon2 Interesting, have you considered sending some of this stuff into mainline? > The biggest remaining hurdle is improving 10G Ethernet performance: > iperf -P 10 on the SDK kernel gets close to 10 Gbit/sec throughput, > while on my 4.4 kernel, it tops out around 1 Gbit/sec. Did you compare throughput and packets per second performance of both kernels using just a single core? > Comparing the octeon-ethernet driver in the SDK > (http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-contrib/tree/drivers/net/ethernet/octeon?h=apaliwal/octeon) > against the one in 4.4, the latter appears to utilize only a single > CPU core for the rx path. It's not clear to me if there is a similar > issue on the tx side, or other bottlenecks. Did you try CONFIG_RPS and moving softirqs into other core(s)? > I started trying to port multi-CPU rx from the SDK octeon-ethernet > driver, but had trouble teasing out just the necessary bits without > following a maze of dependencies on unrelated functions. (Dragging > major parts of the SDK wholesale into 4.4 defeats the purpose of > switching to a vanilla kernel, and doesn't bring us closer to getting > octeon-ethernet out of staging.) > > Has there been any work on the octeon-ethernet driver since this patch > set? https://www.linux-mips.org/archives/linux-mips/2015-08/msg00338.html > > Any hints on what to pick out of the SDK code to improve 10G > performance would be appreciated. One thing that is missing from staging driver for CN68XX is the proper SSO initialization. But I see that you have already implemented that. Unfortunately I don't have a proper CN68XX test system at the moment, so CN68XX support has not progressed much since that patch set from my side. A.
