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

[Jens Axboe]

On Wed, May 07 2003, [e-mail] wrote:
> On  7 May, Jens Axboe wrote:
> > On Wed, May 07 2003, [e-mail] 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.

-- 
Jens Axboe