Re: 2.4.17 SMP hangs ..

From: William Lee Irwin III (wli@holomorphy.com)
Date: Fri Nov 22 2002 - 07:00:49 EST

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On Wed, Nov 20, 2002 at 09:28:06PM -0800, Manish Lachwani wrote:
> I am seeing system hangs with 2.4.17 SMP kernel when doing mke2fs accros 12
> drives in parallel. However, the hangs only occur when the I/O rate from
> vmstat is high:

This is the BKL/irqlock/io_request_lock contention issue. 2.5.x is
the only answer here: it has per-queue locking and has removed the
irqlock from the BKL.

Bill
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