VirtualBox

Ticket #3834 (new defect)

Opened 5 years ago

Last modified 3 years ago

OpenSolaris guest has high system time overhead

Reported by: sfehrman Owned by:
Priority: major Component: other
Version: VirtualBox 2.2.0 Keywords: opensolaris tsc_read gethrtime
Cc: Guest type: Solaris
Host type: other

Description

We created an image using OpenSolaris 2008.11 (32-bit), MySQL, OpenDS, Glassfish to support applications. After the image boots, the apps have started and "steady state" is reached, the image has 30-35% system time constantly being consumed. We've seen this on vbox 2.0.x, 2.1.x, and 2.2.x.

We've seen this happen on the following Host OS platforms: OpenSolaris on Sun Ultra40 (AMD) Mac OS X on MacBookPro (Intel) Linux (Ubuntu 8.10) on Toshiba Laptop (Intel) Windows XP on Acer Laptop (AMD)

I "profiled the kernel" using a dtrace script and the kernel is calling: unixtsc_read / genunixgethrtime_unscaled A LOT.

I'll attach the output of the script and the dtrace script

This might be related to bug # 894

Attachments

vbox_kernel_dtrace_profile.txt Download (11.9 KB) - added by sfehrman 5 years ago.
vbox_kernel_dtrace_profile.2.txt Download (11.9 KB) - added by sfehrman 5 years ago.

Change History

Changed 5 years ago by sfehrman

Changed 5 years ago by sfehrman

comment:1 Changed 5 years ago by sfehrman

Here is the dtrace script ...

#!/usr/sbin/dtrace -s
#pragma D option aggsize=256k
#pragma D option bufsize=256k
BEGIN
{
      interval = 30;
}

profile-997
/arg0 && curthread->t_pri != -1/
{
      @[stack(8)] = count();
      @f[func(arg0),func(caller)]=count();
      total++;
}
tick-1sec
/--interval < 0/
{
      trunc(@,100);
      printa(@);
      trunc(@f,100);
      printa(@f);
      printf("total samples == %d\n",total);
      exit(0);
}

comment:2 Changed 3 years ago by hajma

I'm seeing the same when running Solaris 11express inside Virtualbox OSE 4.0.4 on Fedora 15

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