Re: rtc: lost some interrupts at 256Hz

[Michael Monnerie]

On Freitag, 21. April 2006 00:18 Jan Engelhardt wrote:
> Does not really matter what userspace app is running. If it's mplayer
> the message is "rtc: lost some interrupts at 1024Hz.", and if it's
> VMware it's whatever the Guest OS requires, mostly 2000 or 200 Hz.

The tipps from vmware support at
http://www.vmware.com/support/kb/enduser/std_adp.php?p_sid=tthOqz5i&p_lva=&p_faqid=1420&p_created=1093994398&p_sp=cF9zcmNoPTEmcF9ncmlkc29ydD0mcF9yb3dfY250PTE3JnBfc2VhcmNoX3RleHQ9bG9zdCBzb21lIGludGVycnJ1cHRzJnBfc2VhcmNoX3R5cGU9NyZwX3Byb2RfbHZsMT1_YW55fiZwX3Byb2RfbHZsMj1_YW55fiZwX3NvcnRfYnk9ZGZsdCZwX3BhZ2U9MQ**&p_li=
seem to help, didn't get a "lost some interrupts" warning during the 
last 2 days. But, I got one "many lost ticks" warning:

Apr 23 23:06:51 baum kernel: warning: many lost ticks.
Apr 23 23:06:51 baum kernel: Your time source seems to be instable or 
some driver is hogging interupts
Apr 23 23:06:51 baum kernel: rip __do_softirq+0x4f/0xd0

What I did was
- setup VM host OS to 1000HZ, preemptible kernel
- VM clients use 100HZ, and kernel options "clock=pit nosmp noapic 
nolapic"
- VM client kernels are all non-SMP compiled now.

Still, some kind of documentation in the Linux source tree would be 
nice, explaining what that message means and how to fix it.

mfg zmi
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