Re: 2.4.8-pre1 and dbench -20% throughput

Marcelo Tosatti
2001-07-28T13:40:30Z

On Sat, 28 Jul 2001, Daniel Phillips wrote:

> On Saturday 28 July 2001 01:43, Roger Larsson wrote:
> > Hi again,
> >
> > It might be variations in dbench - but I am not sure since I run
> > the same script each time.
>
> I believe I can reproduce the effect here, even with dbench 2. So the
> next two steps:
>
> 1) Get some sleep
> 2) Find out why

I would suggest getting the SAR patch to measure amount of successful
request merges and compare that between the different kernels.

It sounds like the test being done is doing a lot of contiguous IO, so
increasing readahead also increases throughtput.