Re: [PATCH] ext3 barrier bits

[Chris Mason]

On Sat, 2004-05-22 at 04:33, Andrew Morton wrote:
> Arjan van de Ven <arjanv@xxxxxxxxxx> wrote:
> >
> > 
> > > - Does the kernel tell you if your disk doesn't supoprt barriers?  ie:
> > >   how does the user know if it's working or not?
> > 
> > ... and how do you know your disk isn't lying and ignoring the barriers?
> > 
> 
> If some benchmark slows down when barriers are enabled then that's a pretty
> good indicator.  I don't know what benchmark that might be though.

synctest -t 20 -n 1 -f dir, should show a performance hit when barriers
are on.

-chris


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