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[Qemu-devel] Re: [kvm-devel] [PATCH 0/4] Rework alarm timer infrastrucur


From: Luca Tettamanti
Subject: [Qemu-devel] Re: [kvm-devel] [PATCH 0/4] Rework alarm timer infrastrucure - take2
Date: Wed, 22 Aug 2007 18:12:11 +0200
User-agent: Mutt/1.5.16 (2007-06-11)

Il Wed, Aug 22, 2007 at 08:02:07AM +0300, Avi Kivity ha scritto: 
> Luca Tettamanti wrote:
> 
> > Actually I'm having troubles with cyclesoak (probably it's calibration),
> > numbers are not very stable across multiple runs...
> >   
> 
> I've had good results with cyclesoak; maybe you need to run it in
> runlevel 3 so the load generated by moving the mouse or breathing
> doesn't affect meaurements.

This is what I did, I tested with -no-grapich in text console.

> > The guest is an idle kernel with HZ=1000.
> >   
> 
> Can you double check this?  The dyntick results show that this is either
> a 100Hz kernel, or that there is a serious bug in dynticks.

Ops I sent the wrong files, sorry.

This is QEMU, with dynticks and HPET:

% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 52.10    0.002966           0     96840           clock_gettime
 19.50    0.001110           0     37050           timer_gettime
 10.66    0.000607           0     20086           timer_settime
 10.40    0.000592           0      8985      2539 sigreturn
  4.94    0.000281           0      8361      2485 select
  2.41    0.000137           0      8362           gettimeofday
------ ----------- ----------- --------- --------- ----------------
100.00    0.005693                179684      5024 total

% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 93.37    0.025541           3     10194     10193 select
  4.82    0.001319           0     33259           clock_gettime
  1.10    0.000301           0     10195           gettimeofday
  0.71    0.000195           0     10196     10194 sigreturn
------ ----------- ----------- --------- --------- ----------------
100.00    0.027356                 63844     20387 total

And this KVM:

% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 42.66    0.002885           0     45527        24 ioctl
 25.62    0.001733           0     89305           clock_gettime
 13.12    0.000887           0     34894           timer_gettime
  7.97    0.000539           0     18016           timer_settime
  4.70    0.000318           0     12224      7270 rt_sigtimedwait
  2.79    0.000189           0      7271           select
  1.86    0.000126           0      7271           gettimeofday
  1.27    0.000086           0      4954           rt_sigaction
------ ----------- ----------- --------- --------- ----------------
100.00    0.006763                219462      7294 total

% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 49.41    0.004606           0     59900        27 ioctl
 24.14    0.002250           0     31252     21082 rt_sigtimedwait
  9.65    0.000900           0     51856           clock_gettime
  8.44    0.000787           0     17819           select
  4.42    0.000412           0     17819           gettimeofday
  3.94    0.000367           0     10170           rt_sigaction
------ ----------- ----------- --------- --------- ----------------
100.00    0.009322                188816     21109 total


Luca
-- 
Runtime error 6D at f000:a12f : user incompetente




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