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arch: Change the default topology for x86 guests

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Currently by default each core is allocated it's own socket. Basically
it is n socket 1 core 1 thread/core kind of a structure as witnessed
from within the guest.

CPU(s):                             8
On-line CPU(s) list:                0-7
Thread(s) per core:                 1
Core(s) per socket:                 1
Socket(s):                          8
NUMA node(s):                       1

This is not a good default topology because resources are distributed
across multiple sockets. For example, a Linux guest with multi socket
configuration will have to calibrate TSC per socket due to which it
might observe a higher amount of boot time than usual.

A better idea for default topology would be 1 socket n core 1
thread/core which ensure better resource locality.

After this change topology would change to:

CPU(s):                             8
On-line CPU(s) list:                0-7
Thread(s) per core:                 1
Core(s) per socket:                 8
Socket(s):                          1
NUMA node(s):                       1

Fixes: #6497

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>
This commit is contained in:
Jinank Jain 2024-06-03 11:44:10 +05:30 committed by Liu Wei
parent 06e8d1c40c
commit 3414586995
1 changed files with 4 additions and 8 deletions
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12
vmm/src/cpu.rs
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@ -60,7 +60,9 @@ use hypervisor::kvm::kvm_ioctls::Cap;
use hypervisor::kvm::{TdxExitDetails, TdxExitStatus};
#[cfg(target_arch = "x86_64")]
use hypervisor::CpuVendor;
use hypervisor::{CpuState, HypervisorCpuError, HypervisorType, VmExit, VmOps};
#[cfg(feature = "kvm")]
use hypervisor::HypervisorType;
use hypervisor::{CpuState, HypervisorCpuError, VmExit, VmOps};
use libc::{c_void, siginfo_t};
#[cfg(all(target_arch = "x86_64", feature = "guest_debug"))]
use linux_loader::elf::Elf64_Nhdr;
@ -846,13 +848,7 @@ impl CpuManager {
#[cfg(target_arch = "x86_64")]
let topology = self.config.topology.clone().map_or_else(
|| {
#[cfg(feature = "mshv")]
if matches!(self.hypervisor.hypervisor_type(), HypervisorType::Mshv) {
return Some((1, self.boot_vcpus(), 1));
}
None
},
|| Some((1, self.boot_vcpus(), 1)),
|t| Some((t.threads_per_core, t.cores_per_die, t.dies_per_package)),
);
#[cfg(target_arch = "x86_64")]