Re: pagebuf_prepare_write doesn't kmap the page

[Andi Kleen <ak@xxxxxxx>]

On Wed, Jan 31, 2001 at 06:31:17PM +0100, Jens Axboe wrote:
> On Wed, Jan 31 2001, Steve Lord wrote:
> > 
> > To follow up on my own message - running some micro benchmarks, every single
> > individual operation got faster, but dbench got slower.....
> 
> Dbench being slower in 2.4.1 vs 2.4.0 would be quite normal, and
> I wouldn't be alarmed if it's the only one disturbed by this. The
> easy way to get screamer dbench numbers is to completely ignore
> latency and finish one process I/O at the time only.

This sounds like it would be interesting to modify dbench to log average
running times for individual processes. Then such latency changes could
be catched.


-Andi