From: "Theodore Ts'o" <tytso@mit.edu>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 3.6.0 ext4 dump/filemap_fault?
Date: Mon, 29 Oct 2012 18:35:03 -0400 [thread overview]
Message-ID: <20121029223503.GA9532@thunk.org> (raw)
In-Reply-To: <CAO9zADx=DHHDcj3by9RSMatN4RFOQLzWwPJCZzs=NemQ4_sOUQ@mail.gmail.com>
On Mon, Oct 29, 2012 at 05:51:37PM -0400, Justin Piszcz wrote:
>
> > What happened afterwards?
> It did eventually complete.
>
> > How much memory do you have in your system?
> 32GB memory/32GB swap
> > Did the system continue, and did the sync command (I presume you ran
> > "sync" from the command line?) finally return to the command prompt?
> In this case I did not run sync, I waited for the processes/dump/etc
> to complete.
OK, well *some* process must have issued a sync system call, since
that was what triggered the soft lockup. If half your memory was
dirtied, then the time it might take to write back 16 gigs would
roughly:
(16 GB * 1024 MB/G) / 100 MB/s = 163 seconds
... which would be enough to trigger the soft lockup error.
- Ted
prev parent reply other threads:[~2012-10-29 22:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-28 21:02 3.6.0 ext4 dump/filemap_fault? Justin Piszcz
2012-10-28 22:51 ` Theodore Ts'o
2012-10-29 21:51 ` Justin Piszcz
2012-10-29 22:35 ` Theodore Ts'o [this message]
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