On 05/29/2014 12:42 AM, Chris Murphy wrote:
On May 27, 2014, at 9:30 PM, Gene Czarcinski <gczarcinski@xxxxxxxxx> wrote:
On 05/27/2014 12:56 AM, Chris Murphy wrote:
On May 23, 2014, at 12:46 PM, Adam Williamson <awilliam@xxxxxxxxxx> wrote:
I don't really find them 'astronomically' slow any more, now that
slub_debug is left off most of the time. Slightly slower than regular
kernels, sure, but perfectly fine for testing. Is it different on your
setup?
kernel-core-3.15.0-0.rc6.git0.1.fc21.x86_64
# systemd-analyze
Startup finished in 905ms (kernel) + 1.445s (initrd) + 7.829s (userspace) = 10.180s
kernel-core-3.15.0-0.rc6.git1.1.fc21.x86_64
# systemd-analyze
Startup finished in 4.726s (kernel) + 14.750s (initrd) + 28.758s (userspace) = 48.235s
kernel-core-3.15.0-0.rc6.git1.1.fc21.x86_64 with slub_debug=-
# systemd-analyze
Startup finished in 4.666s (kernel) + 14.890s (initrd) + 28.142s (userspace) = 47.700s
And when the debug kernel is used for installing, the installs are likewise 4-5x longer. For me, it's not usable. The VM is vastly slower, and its host gets hotter and runs fans in noisy mode.
OK, would this "slow kernel" show itself as "long" pauses between packages when installing.
I think so yes.
Also, an install for a simple LXDE desktop seems to be taking about 20 minutes.
At least.
Is this a long or a good/short time?
It's long. Non-debug installs are much faster. I just did a live install with a non-debug kernel that took 5 minutes.
BTW, have you seen this problem:
https://bugzilla.redhat.com/show_bug.cgi?id=1101544
Basically, anaconda-yum goes off into the weeds (100% CPU) in the middle
of an install. I have a
strace -p <pid_of_anaconda-yum> >/mnt/xx/strace1.txt
There are also pauses which last a couple of minutes and then things
start up again. If you start strace after it is hung, it shows nothing.
Gene
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