HZ 250 causes choppy animation and slow performance

[Rick Gabriel]

Binary package hint: linux-source-2.6.15

The latest dapper kernel, 2.6.15-25-686, causes slowness and choppy animation on my laptop. linux-image-2.6.15-23-686 works normally and is speedy. I believe this has to do with the following change in the changelog from 2.6.15-23 to 2.6.15-25.

* i386/amd64: Change HZ=1000 to HZ=250. The high frequency was causing high power consumption on some laptops, and also some latency under certain I/O loads.

I never noticed high power consumption on the -23 kernel. Also, the new -25 kernel runs without problems or slowness on my desktop. It is just my laptop that is noticeably slow and choppy.

Here is the CPU info on my laptop:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.20GHz
stepping : 8
cpu MHz : 1197.096
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx est tm2
bogomips : 2396.81

The model is a Panasonic CF-W4.

[Rick Gabriel (klaxian1)]

This also occurs with kernel 2.6.15-26-686.

[Jérôme Guelfucci (jerome-guelfucci-deactivatedaccount)]

Thank you for your bug report. Do you still have this issue with the latest release of Ubuntu ?

[Rick Gabriel (klaxian1)]

No, the laptop works find using Feisty (kernel 2.6.20-16). Thanks.

[Jérôme Guelfucci (jerome-guelfucci-deactivatedaccount)]

Ok, thank you for your answer. I'm marking this as fixed.