On Mon, 8 Jul 2019, Mike Squires wrote:
My desktop is a Supermicro X7DAE dual quad core Xeon (2Ghz), with a 1TB
RAID 1 boot device and a single 4 TB archive device running off a 3ware
9750 PCI-E card. A second RAID 5 array running off an older 3ware 9550
PCI-X card is currently off line (drives pulled). Video is a ATI/AMD
5500 PCI-E card.
History:
Ubuntu Studio (using "Studio) afterwards) 16 ran fine; v 18 was
extremely slow once installed, taking many minutes to complete simple
tasks. I ran 19.04 but although faster than 18 it was still much slower
than 16.
I have since switched to XUBUNTU 19 on the same hardware, speed is OK.
I do not know the Xeons well. I do know that much of the RT patches that
have been added to main line kernel were developed on the Xeon as well as
i3-7 processors. And the lowlatency kernel is only slightly different from
generic. Still, I would at least try running the generic kernel. Note that
the way GRUB works in Studio is the latest lowlatency kernel is listed
first followed by the latest kernel (which may be the same lowlatency
kernel above it) the only way to ensure the generic kernel is selected is
to use the third option which gives a sub menu of all the kernels to
choose from. This is a packaging oddity but does insure the lowlatency
kernel is default.
The other package I would look at is rtirq which may be raising the
priority of your mouse and keyboard above your storage system. The
settings in rtirq should always be set for the system the package is used
with the default tries to be reasonable but I certainly have to change
things for no xruns at low latency even with PCI audio cards. With USB
audio I need to specify that the physical port the audio device uses has
higher priority than any other USB ports. So try disabling
/etc/init.d/rtirq by:
sudo mv /etc/rc5.d/S01rtirq /etc/rc5.d/K01rtirq
Should this prove to be the problem, it should be possible use the same
tool to raise the priority of the storage bits to just below the audio
device. There is work to replace or suplement rtirq with a more dynamic
setup.
Our default-settings has been split up in the last cycle so that
performance type settings have there own package... I don't know what the
package is called but perhaps not using that will also help.
The first packages added tend to be installer and controls. Installer only
runs when the user runs it. Controls does have a daemon (autojack) that
runs from session start to end, but it doesn't ever show in top and
normally sits in a wait state until some DBUS event tells it to do
something. Jackdbus does use some cpu if it is running and certainly more
with lowlatency setting, with latency set to 1024 I see .3%cpu for jack
which means about .6% for pulse if it is bridged.
I certainly will be interested in your findings.
--
Len Ovens
www.ovenwerks.net
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