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scx_layered: Add netdev IRQ balancing node support

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Add support for setting netdev IRQ balancing that is NUMA aware.

Signed-off-by: Daniel Hodges <hodges.daniel.scott@gmail.com>
This commit is contained in:
Daniel Hodges 2024-11-18 06:41:10 -08:00
parent 24999e7f1f
commit 2987513b5e
1 changed files with 19 additions and 0 deletions
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19
scheds/rust/scx_layered/src/main.rs
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@ -1221,6 +1221,7 @@ struct Scheduler<'a> {
nr_layer_cpus_ranges: Vec<(usize, usize)>,
processing_dur: Duration,
topo: Topology,
netdevs: BTreeMap<String, NetDev>,
stats_server: StatsServer<StatsReq, StatsRes>,
}
@ -1536,6 +1537,7 @@ impl<'a> Scheduler<'a> {
proc_reader,
skel,
topo,
netdevs,
stats_server,
};
@ -1563,12 +1565,29 @@ impl<'a> Scheduler<'a> {
}
for (iface, netdev) in self.netdevs.iter_mut() {
let node = self
.topo
.nodes()
.into_iter()
.take_while(|n| n.id() == netdev.node)
.next()
.ok_or_else(|| anyhow!("Failed to get netdev node"))?;
let node_cpus = node.span();
for (irq, irqmask) in netdev.irqs.iter_mut() {
irqmask.clear();
for cpu in available_cpus.iter_ones() {
if !node_cpus.test_cpu(cpu) {
continue;
}
let _ = irqmask.set_cpu(cpu);
}
trace!("{} updating irq {} cpumask {:?}", iface, irq, irqmask);
// If no CPUs are available in the node then spread the load across the node
if irqmask.weight() == 0 {
for cpu in node_cpus.as_raw_bitvec().iter_ones() {
let _ = irqmask.set_cpu(cpu);
}
}
}
netdev.apply_cpumasks()?;
}