Re: PHP performance on Xen domU with mulitple vcpu

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

On Fri, Apr 11, 2025 at 12:35:24PM -0700, Greg A. Woods wrote:
> As far as I know this is only shown in the Xen console output, so:
> 	xl dmesg | fgrep 'Platform timer'

I had to reboot to get that one:
(XEN) Platform timer is 24.000MHz HPET

> Also for fun what does this show:
> 
> 	xl dmesg | fgrep -i tsc

I have this, but it id probably not what you are looking for:
(XEN) altcall hvm_msr_write_intercept+0xb4/0x3a0 dest arch/x86/hvm/vmx/vmx.c#vmx_set_tsc_offset has no endbr64
(XEN) altcall hvm_vcpu_reset_state+0x23b/0x2b0 dest arch/x86/hvm/vmx/vmx.c#vmx_set_tsc_offset has no endbr64
(XEN) altcall tsc_set_info+0x222/0x250 dest arch/x86/hvm/vmx/vmx.c#vmx_set_tsc_offset has no endbr64

After one week of testing, one domU was never able to get ntpq -c kerninfo 
reporting sync, but the local clock did not drift from the NTP server. 
Two other domU were able to quickly sync and to keep it as is. The three
domU are on three different dom0 with the same hardware.


-- 
Emmanuel Dreyfus
manu%netbsd.org@localhost