On Sun, Mar 5, 2017 at 8:47 AM, Tal Abudi <talab...@gmail.com> wrote: > Hi All > > I’m looking for a nice way to pass parameters (list of integers) to each > ixgbe interface. > > Creating /sys entries seems too complex and so I thought about ethtool.
Why mess around with /sys when there is already /proc/irq/*/smp_affinity? It seems a bit convoluted to try to add an interface to set something that is then used by a user-space daemon to set something else that is already writable. > How can I pass private data (a list) to each nic with minimal driver code > change ? What you are talking about would be really invasive. In addition integers assume a single CPU mapping, or fewer than 32 CPUs. In most cases all affinities use a bitmask that is nr_cpus in size. > To clarify, I want to use a customized affinity hint with multi queue. > > For example, on a machine with 12 cores and RSS of 4 I want to set the > RX/TX queues to CPUs 8-11, It would look something like: > > ethtool –set-cpu eth0 8 9 10 11 #to set the affinity hint for the first 4 > queues to cpus 8-11 > > ethtool –set-channels eth0 combined 4 #Recreate 4 Rx/Tx vectors and use the > new and customized affinity hint. > > <Set the regular RX IRQ affinity to the same CPUs> I have what I believe would be a better suggestion. You could leave all 12 queues enabled, and should be able to limit RSS to 4 queues with ethtool -X eth0 equal 4, or if you really want to just restrict RSS to the last 4 queues you could do that by messing with the weights and just restricting the first 8 weights to 0, and the last 4 to 1. The only downside is non-RSS flows are still defaulted to queue 0. If you want to shuffle the queues around then it is just a matter of reprogramming the XPS maps "/sys/class/net/eth0/queues/tx-*/xps_cpus" and IRQ affinities so you could shift the maps around by 4 CPUs. That way queues 4-12 are serviced by CPUs 0-7, and queues 0-3 would be serviced by CPUs 8-11. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
