Weird behavior writing to SSD on 2013 MacBook

[Dimitry Andric]

On 05 Feb 2015, at 09:30, Konstantin Belousov <kostikbel at gmail.com> wrote:
> 
> On Thu, Feb 05, 2015 at 08:56:59AM +0100, Dimitry Andric wrote:
>> If you let bsdtar continue, and press control-T a few times, does the
>> user time (u) increase at all?  Does it ever go any further, if you let
>> it run for a very long time?
>> 
>> I believe a problem may have been introduced by r277922, leading to
>> filesystem hangs in some scenarios.  It looks like this commit is also
>> in dumbbell's github fork:
>> 
>> https://github.com/dumbbell/freebsd/commit/83723416a6bb8695d60c6573722a81086899f521
>> 
> 
> Would be nice if you mailed me with your findings.
> 
> Please try this.
> 
> diff --git a/sys/ufs/ffs/ffs_softdep.c b/sys/ufs/ffs/ffs_softdep.c

Hi Kostik,

Yes, this works: it survived 20 simultaneous svn checkouts of a large
repository, while before the fix just 1 checkout could be enough to let
it get stuck in flswai state.

Thanks for the quick fix.

-Dimitry

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