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sys-tuner: Do not change sysctl parameters to smaller values

This commit is contained in:
Ivan Mironov 2022-09-17 01:48:03 +05:00 committed by Michael Vines
parent f464c69764
commit d200256f55
1 changed files with 31 additions and 16 deletions
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47
sys-tuner/src/main.rs
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@ -67,18 +67,33 @@ fn tune_poh_service_priority(uid: u32) {
#[cfg(target_os = "linux")]
fn tune_kernel_udp_buffers_and_vmmap() {
use sysctl::{CtlValue::String, Sysctl};
fn sysctl_write(name: &str, value: &str) {
use sysctl::{CtlValue::String, Sysctl, SysctlError};
fn sysctl_increase_to(name: &str, value: i64) {
if let Ok(ctl) = sysctl::Ctl::new(name) {
info!("Old {} value {:?}", name, ctl.value());
let ctl_value = String(value.to_string());
match ctl.set_value(String(value.to_string())) {
Ok(v) if v == ctl_value => info!("Updated {} to {:?}", name, ctl_value),
Ok(v) => info!(
"Update returned success but {} was set to {:?}, instead of {:?}",
name, v, ctl_value
),
Err(e) => error!("Failed to set {} to {:?}. Err {:?}", name, ctl_value, e),
if let Ok(old_value) = ctl.value().and_then(|v| {
v.to_string()
.parse::<i64>()
.map_err(|_| SysctlError::ParseError)
}) {
if old_value < value {
info!("Old {} value {}", name, old_value);
let ctl_value = String(value.to_string());
match ctl.set_value(String(value.to_string())) {
Ok(v) if v == ctl_value => info!("Updated {} to {:?}", name, ctl_value),
Ok(v) => info!(
"Update returned success but {} was set to {:?}, instead of {:?}",
name, v, ctl_value
),
Err(e) => error!("Failed to set {} to {:?}. Err {:?}", name, ctl_value, e),
}
} else {
info!(
"Current {} value ({}) >= new value ({}), not changing",
name, old_value, value
);
}
} else {
error!("Failed to read current value of sysctl {} as i64", name);
}
} else {
error!("Failed to find sysctl {}", name);
@ -86,13 +101,13 @@ fn tune_kernel_udp_buffers_and_vmmap() {
}
// Reference: https://medium.com/@CameronSparr/increase-os-udp-buffers-to-improve-performance-51d167bb1360
sysctl_write("net.core.rmem_max", "134217728");
sysctl_write("net.core.rmem_default", "134217728");
sysctl_write("net.core.wmem_max", "134217728");
sysctl_write("net.core.wmem_default", "134217728");
sysctl_increase_to("net.core.rmem_max", 134217728);
sysctl_increase_to("net.core.rmem_default", 134217728);
sysctl_increase_to("net.core.wmem_max", 134217728);
sysctl_increase_to("net.core.wmem_default", 134217728);
// increase mmap counts for many append_vecs
sysctl_write("vm.max_map_count", "1000000");
sysctl_increase_to("vm.max_map_count", 1000000);
}
#[cfg(unix)]