On Tue, Aug 28 2001, Jens Axboe wrote:
> On Tue, Aug 28 2001, Christoph Rohland wrote:
> > Hi Jens,
> > 
> > I tested both #11 and #13 on my 8GB machine with sym53c8xx. The
> > initialization of a SAP DB database takes 20 minutes with 2.4.9 and
> > with 2.4.9+b13 it took nearly 2.5 hours :-(
> 
> DaveM hinted that it's probably the bounce test failing, so it's
> bouncing all the time. That would explain the much worse performance.
> Could you try with this incremental patch on top of b13 for 2.4.9? I
> still want to see the boot detection info, btw.
> 
> THanks!

Ok found the bug -- SCSI was accidentally using blk_seg_merge_ok when it
just wanted to test if we were crossing a 4GB physical address boundary
or not. Doh! Attached incremental patch should fix the SCSI performance
issue. I'm testing right now...

-- 
Jens Axboe