On 10/18/06, Paul Dembry <[EMAIL PROTECTED]> wrote:
My installation is SUSE 10 running on the Hercules S/390 emulator running on RedHat. It all runs fine (rather slowly but it runs). I notice two things. First even at idle, the CPU is burning through about a million instrutions/sec. Also it's constantly beating the emulated dasds. Does anyone else running in a similar configuration see the same activity?
I trust you already set /proc/sys/kernel/hz_timer to 0 to avoid the 100 Hz timer tick? My server runs at 10-20 kips with the hz_timer=0 and 150 kiips with it enabled. Also found the zmd (Novell ZENworks) to have a live of its own. We care about this because it also affects scalability of Linux on z/VM. The 100 Hz timer causes the virtual machine to be dispatched every 10 ms which makes z/VM think the server is still busy. With the hz_timer=0 you can have periods of almost a second without any activity, and that's more than enough for z/VM to identify the guest as idle. When in doubt I set up some traces in z/VM to identify the user space application that causes trouble (and find the vendor does not understand the issue when I explain that polling with 25 ms is a bad thing). Rob -- ---------------------------------------------------------------------- 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
