Re: PHP performance on Xen domU with mulitple vcpu

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

On Tue, May 20, 2025 at 01:53:45PM +0000, Taylor R Campbell wrote:
> Can you please try the attached patch and share any output from the
> same dtrace script?

I was not able to reach single-user, the console is swamped with messages
like this:
[  20.6228413] WARNING: hardclock skipped 2063201598ns (21653211628 -> 195900100
30), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6228413] WARNING: hardclock skipped 2020345796ns (21654222348 -> 196338765
52), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6339450] WARNING: hardclock skipped 2062978193ns (21654222351 -> 195912441
58), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6339450] WARNING: hardclock skipped 2063393955ns (21654222352 -> 195908283
97), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6339450] WARNING: hardclock skipped 2063201598ns (21663226259 -> 196000246
61), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6339450] WARNING: hardclock skipped 2020345796ns (21663821392 -> 196434755
96), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6435441] WARNING: hardclock skipped 2062978193ns (21663821395 -> 196008432
02), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6435441] WARNING: hardclock skipped 2063393955ns (21663821396 -> 196004274
41), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6435441] WARNING: hardclock skipped 2063201598ns (21673247023 -> 196100454
25), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6435441] WARNING: hardclock skipped 2062978193ns (21673247024 -> 196102688
31), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6435441] WARNING: hardclock skipped 2020345796ns (21855317851 -> 198349720
55), exceeding maximum of 4294967295ns for timecounter(9)
[  20.6435441] WARNING: hardclock skipped 2063201598ns (21861533320 -> 197983317
22), exceeding maximum of 4294967295ns for timecounter(9)
mer


-- 
Emmanuel Dreyfus
manu%netbsd.org@localhost