Re: HAMMER lockup

[Jasse Jansson <jasse@xxxxxxxxxxxxx>]

On Jun 30, 2008, at 2:22 AM, Matthew Dillon wrote:

> :I've backed up my /home partition and formatted it as HAMMER. I
> :restored it and then moved some files around, did a prune-everything
> :and a reblock, all worked fine. (I love to see how hammer does NOT
> :stress the harddrive, as the LED rarely blinks. ;-)
> :However, 256M of RAM is not enough for HAMMER, but that's not a big
> :issue compared to ZFS.)
>
>     Yah, I like HAMMER's buffering too.  UFS's softupdates has to  
> flush
>     under certain conditions and UFS also uses cluster_write() which
>     tends to want to flush data out as buffers fill up.  HAMMER  
> doesn't
>     have to flush under any circumstances until the number of dirty  
> buffers

Is there/ will there be in the future, a tunable that limits HAMMER's  
buffer allocations ???
I.e. can I tell HAMMER to only use a certain amount of memory and
let me fill up the rest of available RAM as I please.




Kaiser Jasse -- Authorized Stealth Oracle

The axioms of wisdom:
1. Go the SPARC way of life
2. You can't conquer the universe without the knowledge of FORTRAN
3. In the Unix realm, 10% of work fixes 90% of the problems