lkml.org 
[lkml]   [2006]   [Apr]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: rtc: lost some interrupts at 256Hz
Date
On Freitag, 21. April 2006 00:22 Lee Revell wrote:
> I asked about the app because I was wondering whether he had a server
> or a desktop.

It's all servers. The Hz rate can change over time:

Mar 3 02:04:41 baum kernel: rtc: lost some interrupts at 256Hz.
Mar 3 02:04:53 baum kernel: rtc: lost some interrupts at 256Hz.
Mar 3 02:04:55 baum kernel: rtc: lost some interrupts at 256Hz.
Mar 3 02:38:19 baum kernel: rtc: lost some interrupts at 256Hz.
Mar 3 02:42:22 baum kernel: rtc: lost some interrupts at 256Hz.
Mar 16 15:53:50 baum kernel: rtc: lost some interrupts at 2048Hz.
Mar 16 15:54:01 baum kernel: rtc: lost some interrupts at 2048Hz.
Mar 16 16:29:33 baum kernel: rtc: lost some interrupts at 2048Hz.
Mar 29 23:01:36 baum kernel: warning: many lost ticks.

Interesting may be the fact that VMware runs on at least some hosts. I
didn't check if all servers have it, but I found a good article on
vmware support:

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=

So as a summary:
- Lee Revell said changing preemption model from server to voluntary or
preemption could help
- increasing HZ on the vm-host, decreasing in the vm-clients should
help, according to VMware support

It would be good if this information is spread on the support lists, I
saw that question a lot. Also, a short text under Documentation in the
kernel source could be nice, explaining why this happens and what to do
then.

I will try the suggestion from the vmware support link I posted above,
and will report back.

mfg zmi
--
// Michael Monnerie, Ing.BSc ----- http://it-management.at
// Tel: 0660/4156531 .network.your.ideas.
// PGP Key: "lynx -source http://zmi.at/zmi3.asc | gpg --import"
// Fingerprint: 44A3 C1EC B71E C71A B4C2 9AA6 C818 847C 55CB A4EE
// Keyserver: www.keyserver.net Key-ID: 0x55CBA4EE
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2006-04-21 10:55    [W:0.057 / U:0.112 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site