Re: [PATCH] improve jbd fsync batching

[Ric Wheeler]

Arjan van de Ven wrote:
> On Tue, 28 Oct 2008 15:38:05 -0600
> Andreas Dilger <adilger@xxxxxxx> wrote:
>
>   
> > On Oct 28, 2008  16:16 -0400, Josef Bacik wrote:
> >     
> > > I also have a min() check in there to make sure we don't sleep
> > > longer than a jiffie in case our storage is super slow, this was
> > > requested by Andrew.
> > >       
> > Is there a particular reason why 1 jiffie is considered the "right
> > amount" of time to sleep, given this is a kernel config parameter and
> > has nothing to do with the storage?  Considering a seek time in the
> > range of ~10ms this would only be right for HZ=100 and the wait would
> >     
>
> well... my disk does a 50 usec seek time or so.. so I don't mind ;-)
>
> in fact it sounds awefully long to me.
>   

For small writes as well as reads?

If so, it would be great to test Josef's patch against your shiny new 
SSD  :-)

ric

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