Re: After reboot fs with barrier faster deletes then fs with nobarrier

[David Chinner <dgc@xxxxxxx>]

On Fri, Jun 29, 2007 at 01:01:36PM +0100, Szabolcs Illes wrote:
> on my desktop pc:
> 
> WCE=1

hot-cache/cold cache nobarrier is faster. same results as I got.
After reboot, nobarrier is way slow.

> WCE=0

hot-cache/cold-cache is pretty much identical. Same results I got.
After reboot, nobarrier is way slow.

> for cold cache I used: echo 3 > /proc/sys/vm/drop_caches

Same here.

> it looks like this machine is only affected after reboot, maybe the hdd  
> has more cache, then the hdd in my 3 years old laptop.
> on my laptop it was enought to clear the kernel cache.
> 
> How did you do your "cold" tests? reboot or drop_caches?

drop_caches.

So there definitely appears to be something about a reboot that is
causing an issue here. I'll see if I can reproduce it here.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group