We have a few linux servers with kernel.hz_timer = 0 that run under z/VM. I'm not sure how that patch factors into things below.
I know the linux CPU numbers are relative to the CPU z/VM gives the dispatched guest, but how about idle ticks/jiffies from the linux perspective? The VM accounting records show that we usually have CPU to spare, and except during things like compiles, the guests are usually more idle than not from the linux perspective. So if the VM records show that a guest used 10% of the total CPU, and a before/after of /proc/stat shows that half of the ticks were spent in the "idle task", did the guest truly only need 5%? As more guests use CPU, I'd expect that guest's usage to drop below 10% from z/VM's perspective, and the "idle jiffies" to drop from linux's perspective, but the user/nice/system numbers would not change much assuming similar work was being done, and we aren't always running at 100%. Does that sound about right? ~ Daniel ----------------------------------------------------------------------- This message is the property of Time Inc. or its affiliates. It may be legally privileged and/or confidential and is intended only for the use of the addressee(s). No addressee should forward, print, copy, or otherwise reproduce this message in any manner that would allow it to be viewed by any individual not originally listed as a recipient. If the reader of this message is not the intended recipient, you are hereby notified that any unauthorized disclosure, dissemination, distribution, copying or the taking of any action in reliance on the information herein is strictly prohibited. If you have received this communication in error, please immediately notify the sender and delete this message. Thank you. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
