Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option

From: Andrea Arcangeli
Date: Sun Sep 12 2004 - 17:08:18 EST


On Sun, Sep 12, 2004 at 05:36:41PM -0400, Lee Revell wrote:
> But in this case the hardirq handler can run for 2ms, which caused a
> scheduler latency problem, because nothing could run but other IRQs.
> The IRQ threading in Ingo's patches solves the problem, and seems to me
> to be the correct solution.

the irq threading must have a cost, doesn't it? I doubt you want to
offload irqs to a kernel thread on a server, *that* would be slow (irq
nesting is zerocost compared to scheduling a kernel thread).
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/