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Bug 1493072 - [IBM] Review/update sysctl.conf.s390 default values
Summary: [IBM] Review/update sysctl.conf.s390 default values
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Fedora
Classification: Fedora
Component: initscripts
Version: 28
Hardware: s390
OS: Linux
high
high
Target Milestone: ---
Assignee: Lukáš Nykrýn
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On: 1493069
Blocks: ZedoraTracker
TreeView+ depends on / blocked
 
Reported: 2017-09-19 10:08 UTC by David Kaspar // Dee'Kej
Modified: 2018-11-02 09:12 UTC (History)
12 users (show)

Fixed In Version: initscripts-9.78-1
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1493069
Environment:
Last Closed: 2018-11-02 09:12:45 UTC
Type: Bug
Embargoed:


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System ID Private Priority Status Summary Last Updated
IBM Linux Technology Center 159108 0 None None None 2017-09-22 10:53:45 UTC

Description David Kaspar // Dee'Kej 2017-09-19 10:08:45 UTC
+++ This bug was initially created as a clone of Bug #1493069 +++

I'm cloning the RHEL-7 BZ, with the same questions for IBM, but in regards to Fedora and the future of Fedora/RHEL.

----------------------------------

Therefore, I would like to hereby ask IBM representatives, what should be correct default values on IBM's s390 (and s390x if needed) architectures for these settigs on Fedora?

----------------------------------

# Kernel sysctl configuration file
#
# For binary values, 0 is disabled, 1 is enabled.  See sysctl(8) and
# sysctl.conf(5) for more details.

# Controls the use of TCP syncookies
net.ipv4.tcp_syncookies = 1

# Do not spend as much process time too early to write out dirty pages
vm.dirty_ratio = 40

# Increase the average time a process runs continuously and also improve the
# cache utilization and server style workload throughput at minor latency cost
kernel.sched_min_granularity_ns = 10000000
kernel.sched_wakeup_granularity_ns = 15000000
kernel.sched_tunable_scaling = 0
kernel.sched_latency_ns = 80000000

# Controls the maximum shared segment size, in bytes
kernel.shmmax = 4294967295

# Controls the maximum number of shared memory segments, in pages
kernel.shmall = 268435456

----------------------------------

(https://github.com/fedora-sysv/initscripts/blob/master/sysctl.conf.s390)

----------------------------------

Would IBM be okay with completely removing all of these settings, and using default kernel values?

We would like to drop that configuration file in Fedora completely, and use the systemd/kernel default values. (We currently do this for other architectures using Fedora.)

Thank you in advance!

----------------------------------

@dhorak: Please, forward this request to IBM. Quick response from IBM is welcomed.

Comment 1 Fedora End Of Life 2018-02-20 15:23:43 UTC
This bug appears to have been reported against 'rawhide' during the Fedora 28 development cycle.
Changing version to '28'.

Comment 3 Zbigniew Jędrzejewski-Szmek 2018-11-01 15:41:53 UTC
Let's just remove them, and see if anybody complains.

Comment 4 Dan Horák 2018-11-01 15:58:47 UTC
yes, drop it

Comment 5 Zbigniew Jędrzejewski-Szmek 2018-11-02 09:12:45 UTC
Duh, it was already dropped in initscripts-9.78-1.


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