[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Test - how many XEN VPS can run on my server
On Mon, May 24, 2010 at 3:12 PM, Shvayakov A. <a.shvayakov@xxxxxxxxx> wrote: > I hope to calculate the critical number of UPU and was looking for a > point nonlinear parameter changes, but I get unstable situation > > Sometime I get: > BUG: soft lockup - CPU#1 stuck for 61s! [sshd:769] > BUG: soft lockup - CPU#8 stuck for 61s! [swapper:0] > > Kernel parameter kernel.softlockup_thresh = 60 and unavailable for > change. linux-image-2.6.26-2-xen-amd64 is known to have some problems, and this might be one of them. I'm not sure if Debian guys even maintain it anymore. If it were me, I'd go with known-to-work configuration with well-maintained kernel. Centos 5.4/RHEL 5.5 is a good start. Since you're basically only use apache and rsync, it should be sufficient for your test. Another option would be to try newer kernels and hope the problem was fixed there. This might be a little hard though, and does not guarantee to fix your problem. >> I'd start by looking at disk statistics. It's possible that you're >> running out of disk IOPS. Try "iostat -x 3" on dom0, and see if disk >> utilization is at 100%. > > Yes - ioutil% is growing very rapidly and without any apparent reason Why did you say "without any apparent reason"? AFAIK by default every reads to a file will result in a write to update atime. That's why I usually set mount option "noatime". Your test should be I/O heavy. In that case the bottleneck would be your disk, not CPU or memory. Having lots of properly-configured disk might help. If the disk is only 4 x 1 TB (for example), then you definitely need to increase the number of disks to support that many I/O-intensive domUs. -- Fajar _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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