[Bug 1183135] Re: On running network and I/O traffic on SM15000-XE, "BUG: soft lockup -- CPU#0 stuck for 22s!" seen on dmesg

[Samantha Jian-Pielak]

Comment from Vikrant: 
With Ubuntu 12.04, we see TX hang and exceptions on running network traffic.

This is seen particularly on Intel platforms.

The issue seems to arise because of the fact that irqbalance does not
balance the interrupts evenly across all available cores. Ubuntu 12.04
uses 0.56-1ubuntu4 irqbalance package.

As a workaround, we tried to use the irqbalance package from an older
version of Ubuntu, namely 0.55+20091017-3ubuntu2, and it worked very
well. We see the full expected performance and there are no TX hangs or
exceptions. The interrupts seem to be spread evenly across all cores.


** Changed in: ubuntu
     Assignee: (unassigned) => Samantha Jian-Pielak (samantha-jian)

** Package changed: ubuntu => irqbalance (Ubuntu)

** Changed in: irqbalance (Ubuntu)
     Assignee: Samantha Jian-Pielak (samantha-jian) => (unassigned)

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https://bugs.launchpad.net/bugs/1183135

Title:
  On running network and I/O traffic on SM15000-XE, "BUG: soft lockup --
  CPU#0 stuck for 22s!" seen on dmesg

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