for certain CPU architecture, disable spectre and meltdown mitigations. (be certain
network to physical nodes is secure from internet access) (use apt proxy, http(s), curl
proxy servers)
Try to toggle on or off the physical on disk cache. (raid controller command)
^I had same issue, doing both of these fixed it. In my case the disks I had needed on disk
cache hard set to ‘on’. raid card default was not good. (be sure to have diverse power and
UPS protection if needed to run on disk cache on) (good RAID. battery if using raid cache
improves perf.)
to see the perf impact of spec. and melt. mitigation vs. off, run: dd if=/dev/zero
of=/dev/null
^i run for 5 seconds and then ctl+c
will show a max north bridge ops.
to see the difference in await and IOPs when toggle RAID card features and on disk cache I
run: iostat -xtc 2
and use fio to generate disk load for testing IOPs. (google fio example commands)
^south bridge +raid controller to disks ops and latency.
-Edward Kalk
Datacenter Virtualization
Performance Engineering
Socket Telecom
Columbia, MO, USA
ekalk(a)socket.net
On Nov 12, 2020, at 4:45 AM, athreyavc
<athreyavc(a)gmail.com> wrote:
Jumbo frames enabled and MTU is 9000