From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Greg Steuck <greg@nest.cx>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: RT wakeup woes in Linux 2.6.31.6 on Mac Mini
Date: Fri, 13 Nov 2009 10:43:38 +0000 [thread overview]
Message-ID: <20091113104338.503e53d4@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <a27c0c970911121552w63f63baew93d06336b39816a5@mail.gmail.com>
> 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 ?
prev parent reply other threads:[~2009-11-13 10:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-12 23:52 Greg Steuck
2009-11-13 0:14 ` Steven Rostedt
2009-11-14 1:24 ` Greg Steuck
2009-11-13 10:43 ` Alan Cox [this message]
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