Re: [Bugme-new] [Bug 15426] New: Running many copies of bonnie++on different filesystems seems to deadlock in sync

[John Hughes]

Jens Axboe wrote:
> On Wed, Mar 03 2010, John Hughes wrote:
>   
> > Just a thought.  What exactly is sync(2) supposed to do - block until  
> > there are no more dirty pages, or block until all pages that were dirty  
> > when the sync was done are clean?  In other words is the problem simply  
> > that pages are being dirtied faster than the sync is writing them out?
> >     
>
> Our sync is currently broken in that regard, since it'll wait for too
> long. We have a debated patch going, I have included it below. Any
> chance you could give it a whirl?
>
> The semantics of sync are supposed to be 'wait for dirty IO generated
> BEFORE this sync call'.
>   
Ok, I will try this patch and get back to you.

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