From: Jakub Kicinski <k...@kernel.org> Date: Mon, 11 Dec 2023 11:23:32 -0800
> On Mon, 11 Dec 2023 11:16:20 +0100 Alexander Lobakin wrote: >> Ideally, I'd like to pass a CPU ID this queue will be run on and use >> cpu_to_node(), but currently there's no NUMA-aware allocations in the >> Intel drivers and Rx queues don't get the corresponding CPU ID when >> configuring. I may revisit this later, but for now NUMA_NO_NODE is the >> most optimal solution here. > > Hm, I've been wondering about persistent IRQ mappings. Drivers > resetting IRQ mapping on reconfiguration is a major PITA in production > clusters. You change the RSS hash and some NICs suddenly forget > affinitization 🤯️ > > The connection with memory allocations changes the math on that a bit. > > The question is really whether we add CPU <> NAPI config as a netdev > Netlink API or build around the generic IRQ affinity API. The latter > is definitely better from "don't duplicate uAPI" perspective. > But we need to reset the queues and reallocate their state when > the mapping is changed. And shutting down queues on > > echo $cpu > /../smp_affinity_list > > seems moderately insane. Perhaps some middle-ground exists. > > Anyway, if you do find cycles to tackle this - pls try to do it > generically not just for Intel? :) Sounds good, adding to my fathomless backlog :> Thanks, Olek _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan
