[edk2-devel] EDK2 UpdateVariable very slow for the first defined VM on aarch64 with preempt-rt kernel

[edk2-devel] EDK2 UpdateVariable very slow for the first defined VM on aarch64 with preempt-rt kernel

[wanglimin]

[-- Attachment #1: Type: text/plain, Size: 1185 bytes --]

Hi Ard,

I notice that you had ever worked on VirtNorFlashDxe, and maybe can help me on the following trouble.

I am trying to boot kvm VM on aarch64(arm-v8) with preempt-rt kernel host,
the UpdateVariable is very very slow, and the uefi boot take about ~80s to get to phase,
while it takes only about ~15s on a normal linux kernel or on x86 hardware.

This only happen when the VM is first defined, or redefine the VM:
virsh destroy VM;
virsh undefine VM --nvram
virsh define VM.xml ;
virsh start VM
It seems the most time spending when VirtNorFlash write operation at MmioWrite32();
On X64 platform，it seems use EmuVariableFvbRuntimeDxe driver，not really write the NorFlash device，
Is it possible for arm to use the similar way as X64 ?

Could you give any suggestion?

Best Regards.
Limin Wang




-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#120927): https://edk2.groups.io/g/devel/message/120927
Mute This Topic: https://groups.io/mt/110222787/7686176
Group Owner: devel+owner@edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [rebecca@openfw.io]
-=-=-=-=-=-=-=-=-=-=-=-



[-- Attachment #2: Type: text/html, Size: 5661 bytes --]