Public bug reported:
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.
** Affects: linux-source-2.6.15 (Ubuntu)
Importance: Untriaged
Status: Unconfirmed
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HZ 250 causes choppy animation and slow performance
https://launchpad.net/bugs/51123
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