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Diffstat (limited to 'gitlab/issues/target_i386/host_missing/accel_missing/2848.toml')
| -rw-r--r-- | gitlab/issues/target_i386/host_missing/accel_missing/2848.toml | 25 |
1 files changed, 0 insertions, 25 deletions
diff --git a/gitlab/issues/target_i386/host_missing/accel_missing/2848.toml b/gitlab/issues/target_i386/host_missing/accel_missing/2848.toml deleted file mode 100644 index 6904fe5ab..000000000 --- a/gitlab/issues/target_i386/host_missing/accel_missing/2848.toml +++ /dev/null @@ -1,25 +0,0 @@ -id = 2848 -title = "i386 max_cpus off by one" -state = "opened" -created_at = "2025-03-02T00:58:09.053Z" -closed_at = "n/a" -labels = ["target: i386"] -url = "https://gitlab.com/qemu-project/qemu/-/issues/2848" -host-os = "NixOS" -host-arch = "x86" -qemu-version = "9.1.2" -guest-os = "n/a" -guest-arch = "x86" -description = """X86 VMs are currently limited to 255 vCPUs (`mc->max_cpus = 255;` in `pc.c`). -The first occurrence i can find of this limit is in d3e9db933f416c9f1c04df4834d36e2315952e42 from 2005 where both `MAX_APICS` and `MAX_CPUS` was set to 255. This is becoming relevant for some people as servers with 256 cores become more available. - -**Can we increase the limit to 256 vCPUs?** -I think so. - -Today, the APIC id limit (see `apic_id_limit` in `x86-common.c`) is based on the CPU id limit. -According to the a comment for `typdef uint32_t apic_id_t;` (see `topology.h`), we can have 256 APICs, but more APICs require x2APIC support. -APIC seems to be no hindrance to increase max_cpus to 256. - -**Can we increase the limit to 512?** Maybe not? We need x2APIC support of which i have no clue. Also there is always a performance risk of exceeding the size at which current data structures work efficiently.""" -reproduce = "n/a" -additional = "n/a" |