linux-kernel - Re: RT wakeup woes in Linux 2.6.31.6 on Mac Mini

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Date:	Fri, 13 Nov 2009 10:43:38 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Greg Steuck <greg@...t.cx>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: RT wakeup woes in Linux 2.6.31.6 on Mac Mini

> trace.13653:kblockd/-65      1dN..  132us+: blk_rq_map_sg <-scsi_init_sgtable
> trace.13653:kblockd/-65      1dN..  200us+: blk_rq_map_sg <-scsi_init_sgtable
> trace.13653:kblockd/-65      1dN..  264us+: ata_tf_to_fis <-ahci_qc_prep
> trace.13653:kblockd/-65      1dN..  289us+: blk_rq_map_sg <-scsi_init_sgtable
> trace.13653:kblockd/-65      1dN..  349us+: ata_tf_to_fis <-ahci_qc_prep

Something very weird with your tracing there ata_tf_to_fis simply moves
20 bytes of memory about. It could be you are hitting some kind of
caching effect with the AHCI controller I guess. Certainly looks odd of
itself.

> ...
> trace.6039: pdflush-5162    1d.s.    0us :   5162:120:R   + [001]
> 6040:  0:S rxtest
> trace.6039: pdflush-5162    1dN..   61us+: idle_cpu <-irq_exit
> trace.6039: pdflush-5162    1dN..  130us!: idle_cpu <-irq_exit
> trace.6039: pdflush-5162    1dN..  273us!: idle_cpu <-irq_exit

What power management do you have enabled ?
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