Re: OSDL DBT-2 AS vs. Deadline 2.5.68-mm2

[Mark Haverkamp <markh@osdl.org>]

On Wed, 2003-05-07 at 10:36, Jens Axboe wrote:
> On Wed, May 07 2003, markw@osdl.org wrote:
> > On  7 May, Jens Axboe wrote:
> > > On Wed, May 07 2003, markw@osdl.org wrote:
> > >> I've collected some data from STP to see if it's useful or if there's
> > >> anything else that would be useful to collect. I've got some tests
> > >> queued up for the newer patches, but I wanted to put out what I had so
> > >> far.
> > >> 
> > >> 
> > >> METRICS OVER LAST 20 MINUTES:
> > >> --------------- -------- ----- ---- -------- -----------------------------------
> > >> Kernel          Elevator NOTPM CPU% Blocks/s URL                                
> > >> --------------- -------- ----- ---- -------- -----------------------------------
> > >> 2.5.68-mm2      as        1155 94.3   8940.2 http://khack.osdl.org/stp/271356/  
> > >> 2.5.68-mm2      deadline  1255 94.9   9598.7 http://khack.osdl.org/stp/271359/  
> > >> 
> > >> FUNCTIONS SORTED BY TICKS:
> > >> -- ------------------------- ------- ------------------------- -------
> > >>  # as 2.5.68-mm2             ticks   deadline 2.5.68-mm2       ticks  
> > >> -- ------------------------- ------- ------------------------- -------
> > >>  1 default_idle              6103428 default_idle              5359025
> > >>  2 bounce_copy_vec             86272 bounce_copy_vec             97696
> > >>  3 schedule                    63819 schedule                    70114
> > >>  4 __make_request              30397 __blk_queue_bounce          31167
> > >>  5 __blk_queue_bounce          26962 scsi_request_fn             26623
> > >>  6 scsi_request_fn             24845 __make_request              25012
> > > 
> > > uhh nasty, you are spending a lot of time bouncing. How much RAM is in
> > > the machine, and what is the scsi hba?
> > 
> > The system has 4GB of memory and has a DECchip 21554 (aacraid) that the
> > external drives are connected to.  Mark Haverkamp is currently trying to
> > address those bounce buffers.
> 
> aacraid actually looks sane enough. so you should just be able to set
> host->highmem_io and it should work.

That is what I thought, but I wanted to get a machine with lots of
memory to try it out on.

Mark.
-- 
Mark Haverkamp <markh@osdl.org>