Interesting, thanks for sharing. I don't seem to have logwatch on any of our sles 11 sp1 systems. We use LVM. I guess that means it's not a necessity. Perhaps you can just remove it? Or is it perhaps something specific to an FCP environment (which we don't have)
Marcy -----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Srivastava, Sagar Sent: Wednesday, May 02, 2012 9:48 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: [LINUX-390] MIPS increase after SLES11 SP1 patches Thanks to Brent and Barton for your reply, I was not successful in compiling PowerTOP in SLES11 (s390), probably sources need some tweaking since it is Intel platform centric. If anyone has compiled it successfully, I will be glad to know. I found the solution to my problem, though! Novell Bug #724164 was fixed in this patch update that we did, where 'logwatch' package was updated from logwatch-7.3.6-65.66.1 to logwatch-7.3.6-65.72.1. This is also used by LVM monitoring facility called dmraid and internally uses cron to run a job every minute and the job is intensive that it runs for 10 seconds. On an average it comes out to be 0.8% CPU per guest. Earlier this LVM monitoring facility was failing hence it did not use any CPU due to the above Bug in logwatch package. please notice description and comment #7 in below URL I found through our great Google, which was my problem too: https://bugzilla.novell.com/show_bug.cgi?id=724164 The process that was visible in an aggressive view 'ps' script was "/usr/sbin/logwatch --service dmeventd" which led me find this. Standard Linux commands like top could not show the process since it ran for 10 seconds per minute only. Later, I determined that such an aggressive logwatch scan for LVM monitoring(1 per minute) is an overkill for our resource constrained servers and decided to run at lesser frequency instead also because we don't do RAID on our systems anyway. I wanted the group to know my solution just in case someone else encounters the same problem. Thanks for going through my long posting. Sagar -----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Brent Kincer Sent: Friday, April 27, 2012 3:08 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: MIPS increase after SLES11 SP1 patches Have you tried using powertop to investigate? Sure the tool was intended on tracking power consumption, but it's very useful for seeing what is waking up your guests. Just a thought... On Fri, Apr 27, 2012 at 2:28 PM, Srivastava, Sagar <ssrivast...@iso.com>wrote: > > > > > We implemented latest patches on our SLES11 SP1 systems recently > > > > Now all the zLINUX guest are using almost 8 - 10 IFL mips extra per > Guest - that is increasing our load on the z/VM LPARs by 300 mips . > Unfortunately this is not so visible from the guest level and hence > difficult to find the culprit process/component. We have around 35 > guests per LPAR. > > > > I know there is some degree of overhead with patching and security - > but this seems excessive. > > > > Our workload is primarily websphere/java applications type. > > > > > > I have tried: > > 1) investigating top/sar etc command and process lists > > 2) checked Omegamon-can pinpoint nothing yet > > 3) several linux commands tools to (iostat/mpstat/iptraf etc but can > find nothing. > > > > > > Any insight from the gurus? Has anyone noticed this situation? Thanks > for going through my long note. > > > > Sagar Srivastava > > ISO, > > jersey city > > This email is intended for the recipient only. If you are not the intended recipient please disregard, and do not use the information for any purpose. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
