Re: PHP performance on Xen domU with mulitple vcpu

On Sat, Apr 05, 2025 at 01:49:32AM +0000, Taylor R Campbell wrote:
> And, can you send output of the following before and after you've
> observed trouble with ntpd (with or without the patch, or both -- just
> tell me which)?

running a -current kernel as of yesterday, without out patch
ntpq -c kerninfo shows maximum_error raising from 16000 by 0.5s each
second.
# vmstat -e | grep -E 'cpu.*(time|tsc|clock)'
vcpu0 missed hardclock                                   11    0 intr

I was not able to load dtrace:
kobj_checksyms, 1013: [dtrace]: linker error: symbol `dtrace_smap_enable' not found

With your patch: same ntpd behavior. 
# vmstat -e | grep -E 'cpu.*(time|tsc|clock)'
vcpu0 missed hardclock                                   12    0 intr

I will look into the dtrace module problem.

-- 
Emmanuel Dreyfus
[email protected]