|To:||Ralf Baechle <firstname.lastname@example.org>|
|Subject:||Re: [PATCH 0/2] Alchemy: fix interrupt routing|
|From:||Sergei Shtylyov <email@example.com>|
|Date:||Wed, 05 Dec 2007 22:22:20 +0300|
|Cc:||Manuel Lauss <firstname.lastname@example.org>, email@example.com|
|Organization:||MontaVista Software Inc.|
|References:||<firstname.lastname@example.org> <4756D42E.email@example.com> <20071205182353.GC10697@linux-mips.org> <4756F494.firstname.lastname@example.org> <20071205191208.GA12547@linux-mips.org>|
|User-agent:||Mozilla/5.0 (X11; U; Linux i686; rv:1.7.2) Gecko/20040803|
Ralf Baechle wrote:
41 total events, 5.109 events/sec
That's the expected behaviour, good.
One of the remaining problems on some platforms with tickless kernels is that not all clocksource / clockevent driver combinations are playing nicely with each other. You can switch the clocksource driver manually at runtime. First let's see what clocksource we have: # cd /sys/devices/system/clocksource/clocksource0/# cat available_clocksource MIPS pit jiffies
I only have MIPS and jiffies of course. :-)
# cat current_clocksource MIPS
MIPS is the CP0 count register. pit is the i8259 and jiffies simply counts interrupts like in the old days so has problems with lost timer interrupts and generally not such a great idea for tickless. You should be able to switch between all these drivers by something like:
# echo jiffies > current_clocksource Time: jiffies clocksource has been installed. #
Try switching between all the available clocksources a few times to see if that's working right also.
It died after I selected jiffies.
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