[ubuntu-studio-devel] Ubuntu Studio 19.10 and Xubuntu 19.04 and dual quad core Xeon E5335 CPUs

[Mike Squires]

I finally learned how to update the kernel on my desktop installation 
(very easy once I learned the correct way).

Ubuntu Studio 19.10 runs on my Supermicro X7DAE/Xeon E5335/3Ware 9750 
SATA RAID/AMD HD 5570 system but large file copies or opening large 
applications like LibreOffice is very slow.  I had a similar problem 
with 18 but not with 16.

The version of 19.10 I installed seems to only have versions of the 
kernel installed with the low latency option installed.  I installed 
5.3.1 generic and ran some comparisons.

For the Xubuntu and Ubuntu Studio systems both running generic kernels 
the time to copy a 415MB file and time to open a LibreOffice ODS file 
from choice of kernel at boot time was about the same, about 5 seconds 
to copy the large file and 1 min 30 seconds to open the ODS file.

The low latency kernel increased the Ubuntu Studio time to copy the file 
to nearly two minutes and the time to open the ODS file to more than 14 
minutes.

I ran the old Byte UnixBench benchmark using all three kernels. There 
were no significant differences between timings between the three (file 
attached).  This was surprising given the differences in file copy and 
boot/open file times.

The Xubuntu timings are from a different boot drive, a pair of 2 TB 
Seagate SATA drives in a RAID 1 array; the two Ubuntu Studio timigns use 
a pair of 1.36 TB Seagate SATA drives also in a RAID 1 array.

The short answer here is that if I can use a generic kernel then Ubuntu 
Studio works across all of the PCs on which I need to run it; the low 
latency kernel, however, makes using versions 18 and 19 too slow for my 
needs.

I assume that this needs to be reported to Ubuntu via their bug tracking 
program, and I'll do that Real Soon Now.

Mike Squires

-- 
Michael L. Squires, Ph.D., M.P.A.
546 North Park Ridge Road
Bloomington, IN 47408
"Michael Leslie Squires" on FB
Home phone: 812-333-6564
Cell phone: 812-369-5232
www.siralan.org (personal) or
www.smithgreensound.com (PA)
UN*X at home since 1985
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