[Libguestfs] [PATCH v2 0/7] tests/qemu: Add program for tracing and analyzing boot times.

Richard W.M. Jones rjones at redhat.com
Sun Mar 20 12:30:57 UTC 2016

v1 was here:


Not running the 'hwclock' command reduces boot times considerably.
However I'm not sure if it is safe.  See the question I posted on


At the moment, about 50% of the time is consumed by SeaBIOS.  Of this,
about ⅓rd is SGABIOS (it contains a useless ¼s sleep waiting for a
keypress ... ffs!), and the other ⅔rds is something else in SeaBIOS.
Simply removing SGABIOS improves boot times to below 2s, but at a cost
that we cannot see any messages from SeaBIOS so further measurement
and therefore improvement becomes impossible.  I'm going to try to fix
SeaBIOS/SGABIOS first.  See also:



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