Red Hat Bugzilla – Bug 142501
Kernel stack size tunable w/reboot.
Last modified: 2015-01-04 17:13:46 EST
From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET
Description of problem:
VERITAS is requesting a kernel stack size tunable for x86 Red Hat to
enable a customer (or 3rd party ISV) to configure the system with 8k
kernel stack size.
RedHat changed from 8-4K between beta1 and beta2 and removed
interrupts from the stack. VERITAS is concerned that there may not
be enough buffer and customers may experience hangs and system
failures as result of running low on stack space.
VERITAS will be willing to provide performance testing for the
tunable to ensure comfort with this configuration upon RedHat's
Version-Release number of selected component (if applicable):
Steps to Reproduce:
Actual Results: system hang and failure.
Expected Results: n/a
Tossing on the U1 list so it at least remains on the radar.
apparently this change actually occurred between alpha4 and beta1. apparently
we (veritas) didn't do enough testing there to catch it.
We currently have no plans to add in any tunable to vary the stack size. If
Veritas can get such a change upsteam accepted first, then we can revisit the
Note that in RHEL4, the interrupt and softirq stacks are separate. So that
allows the 4K kernel stack to be dedicated to process context.