CONFIG_NO_HZ causing poor console responsiveness
timur at freescale.com
Fri Jul 2 07:55:22 EST 2010
On Tue, Jun 29, 2010 at 2:54 PM, Timur Tabi <timur at freescale.com> wrote:
> I'm adding support for a new e500-based board (the P1022DS), and in
> the process I've discovered that enabling CONFIG_NO_HZ (Tickless
> System / Dynamic Ticks) causes significant responsiveness problems on
> the serial console. When I type on the console, I see delays of up to
> a half-second for almost every character. It acts as if there's a
> background process eating all the CPU.
I finally finished my git-bisect, and it wasn't that helpful. I had
to skip several commits because the kernel just wouldn't boot:
There are only 'skip'ped commits left to test.
The first bad commit could be any of:
We cannot bisect more!
These correspond to a batch of scheduler patches, most from Mike Galbraith.
I don't know what to do now. I can't test any of these commits. Even
if I could, they look like they're all part of one set, so I doubt I
could narrow it down to one commit anyway.
Linux kernel developer at Freescale
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