Re: [PATCH] Add "-o bh" option to ext3

[Pavel Machek]

Hi!

> > > Its not really need for now, but as we try to make "nobh"
> > > as default option, it would be nice to have a "-obh" fallback
> > > option - if things go wrong.
> > 
> > Docs patch is missing...
> > 
> > ...and no, it is not even clear to me what bh vs. nobh does...
> 
> Hope this helps.

Not really, I still am not sure what it does. Is it like "nobh is more
effective code, and should have exactly zero impact to the user, but
as it is new, we make it optional"?

								Pavel

> @@ -113,6 +113,14 @@ noquota
>  grpquota
>  usrquota
>  
> +bh		(*)	ext3 associates buffer heads to data pages to
> +nobh			(a) cache disk block mapping information

missing full stop?

> +			(b) link pages into transaction to provide
> +			    ordering guarantees.
> +			"bh" option forces use of buffer heads.
> +			"nobh" option tries to avoid associating buffer
> +			heads (supported only for "writeback" mode).
> +

-- 
15:        try
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/