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Re: [Qemu-devel] Reporting Heisenbugs in qemu

From: Torbjorn Granlund
Subject: Re: [Qemu-devel] Reporting Heisenbugs in qemu
Date: Tue, 07 May 2013 23:43:11 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (berkeley-unix)

Artyom Tarasenko <address@hidden> writes:

  Do I read it correct that qemu-system-ppc64 with the slowdown factor
  of 33 is ~3 times faster than qemu-system-sparc64 with the slowdown
  factor of 96 ?

You read it correctly.

But please see the caveat at the table end.

  Do they both use Debian Wheezy guest? You have a remark that ppc64 has
  problems with its clock. Was it taken into account when the slowdown
  factors were calculated?
The time of a job is computed as the difference between a time stamp
made by the test system and the report time.  The first time is affected
by ppc64's slow clock, the latter is correct.

A cron job sets the clock every 30 minutes, so the ppc time might be
*overestimated* < 30 minutes.


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