On Fri, Dec 01, 2006 at 04:31:02PM -0600, John Alberts wrote: > I'm sorry, I don't have an answer for you, but I do have a question. > What is your cpu utilization with that many guests? I know that > vserver is extremely easy on resources; however, I think on the wiki > it says that some tests show 1-2% resource utilization per guest os.
current devel patches show zero overhead for any guest, so it's just breaking down resources into smaller pieces, sharing some of them ... > with 20 guest running, that's 20-40% resource utilization just for > running empty guests. wrong assumption, with 'empty' guests, it would be zero overhead, well, something about 4-8kbyte for kernel structures at most > Of course, your not running empty guests (and you said some of the > guests are heavily used), so I would expect your server to have very > high resource usage. certain resources are shared, so with a smart config, you can easily get about 100% native performance within a guest, because certain things are shared .. that allows for the high number of guests, btw, production systems are known to carry 150 and more guests, although I would not suggest to do that to your customers :) HTC, Herbert > It may also help someone diagnose your problem by showing the output of > vmstat. > > > On 12/1/06, Chuck <[EMAIL PROTECTED]> wrote: > >suddenly out of nowhere, on a brand new 1 month old dual opteron machine we > >started getting system lockups and crashes.. I managed to track it down to > >a > >bad block in the email mailboxes.. the email server, of necessity for now > >must run on the host since it uses 140ip addresses. eventually we will move > >everyone to namespace and i can put it into a vserver.. > > > >now on to my question. > > > >we have a TON of open files I am sure. Presently there are 20 guests > >running, > >some, like a web server has 260 domain on it and it is quite busy. Are we > >approaching or exceeding some kind of system resource limit maybe? > > > >I never get to see the console since the server is 1000 miles away, but > >this > >morning someone read a msg that seemd to be information only. I have no > >clue > >what this means: Kernel Direct Mapping Table up to 100,000,000 @8000:d800. > > > >Any clues? Any advice how to set higher resources in the host system if > >this > >is becoming a problem? I have never had to do this before but also have not > >worked on a system so large. We are only about half done. I expect there to > >be approx 50-60 vservers on this machine with at least 15-20 of them very > >busy. > > > >The host install is 100% stock Gentoo with no modifications other than > >what is > >needed to run vservers. The kernel is 2.6.18-vs2.0.2-gentoo-r8 with > >util-vserver 0.30.211. Everything is compiled 2006.1 gcc 4.1.1 and > >glibc .2.4-r4:2.2. > > > >The disk subsystem is a SATA2 hardware raid5 with all partitions except > >root > >boot and swap, using LVM2. At present there are 27 mount points used. > > > > > > > >-- > > > >Chuck > > > > > > > > > >_______________________________________________ > >Vserver mailing list > >[email protected] > >http://list.linux-vserver.org/mailman/listinfo/vserver > > > _______________________________________________ > Vserver mailing list > [email protected] > http://list.linux-vserver.org/mailman/listinfo/vserver _______________________________________________ Vserver mailing list [email protected] http://list.linux-vserver.org/mailman/listinfo/vserver
