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Re: xfsaild centisecs /proc wakeup control?

To: "Linda A. Walsh" <xfs@xxxxxxxxx>
Subject: Re: xfsaild centisecs /proc wakeup control?
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Wed, 08 Oct 2008 15:45:12 -0500
Cc: xfs-oss <xfs@xxxxxxxxxxx>
In-reply-to: <48ED0DA9.7070002@tlinx.org>
References: <48ED0DA9.7070002@tlinx.org>
Sender: xfs-bounce@xxxxxxxxxxx
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Linda A. Walsh wrote:
> I was looking at powertop again recently, and noticed xfsbufd and xfsaild at 
> the top
> of the wakeup list. 
> xfsbufd can be tuned with /proc/sys/fs/xfs/xfsbufd_centisecs along with 3 
> other
> time-related tunables.  However, I don't see one for xfsaild.  Is that an 
> oversight?


On what kernel?

As far as the wakeups go, I thought this was fixed; see for example:
TAKE 977545 - xfsaild causing too many wakeups

on 2.6.27-rc8 with xfs mounted, and powertop 1.9, I don't see xfs up
very high at all:

Top causes for wakeups:
  29.4% ( 15.0)       <interrupt> : pata_sil680
   9.4% (  4.8)       <interrupt> : eth0
   7.8% (  4.0)            iscsid : __mod_timer (process_timeout)

...

   2.0% (  1.0)           xfsbufd : __mod_timer (process_timeout)
   2.0% (  1.0)           xfsaild : __mod_timer (process_timeout)


-Eric


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