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    SubjectRe: [patch] 2.6.6-rc2 Allow architectures to reenable interrupts on contended spinlocks
    Date
    On Mon, 26 Apr 2004 21:49:52 -0700, 
    Andrew Morton <akpm@osdl.org> wrote:
    >Keith Owens <kaos@sgi.com> wrote:
    >>
    >> Enable interrupts while waiting for a disabled spinlock, but only if
    >> interrupts were enabled before issuing spin_lock_irqsave(). It makes a
    >> measurable difference to interrupt servicing on large systems.
    >
    >Do you know which are the offending locks?

    Workload dependent. We already service interrupts while waiting for a
    non-disabled spinlock. The patch allows a cpu to do some useful work
    and service interrupts while waiting for disabled spinlocks as well.

    >How much difference, and how large are the systems?

    From memory (September 2003) 3-5% improvement on an AIM7 run, with 64
    processors.

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