Date: Thu, 9 Jun 2005 01:11:33 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: glebius@FreeBSD.org Cc: current@FreeBSD.org Subject: link state changes take a "long" time to execute Message-ID: <20050609010700.V95135@fledge.watson.org>
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I'm running with task queue instrumentation on my notebook, and generate warnings when task queues take more than 1/10th of a second to execute. Normally the warnings fire only during the boot when tasks start being scheduled by ACPI, but the ACPI task queue thread isn't yet being scheduled to run because the scheduler hasn't been kicked off yet. I saw one this afternoon as follows: taskqueue_run: warning, queue time of 0.133978201 for context 0xc0687c90 On my kernel, this function pointer resolves to: c0687c90 t do_link_state_change So it sounds like there's a substantial delay in the link change thread -- probably because another task takes a long time to execute, maybe blocking or delaying the task thread and preventing another task from running. On this box, I'm running with an idle if_xl, and an in-use if_wi, which probably went into the associated state about when the message was printed. Kernel source date is June 3. Robert N M Watson
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