Re: [PATCH] new data logging and quota patches available

[Chris Mason <mason@suse.com>]

On Mon, 2003-02-24 at 13:05, Marc-Christian Petersen wrote:

> I just tried it with:
> 
> - time seq -f "%06.0f" 1 100000  | xargs touch
> 
> v35-aa took about 4 seconds to complete this.
> v36-aa took about 6 seconds to compelte this.
> 
> Mounted with:
> nosuid,nodev,noexec,noatime,nodiratime,notail,block-allocator=noborder

For benchmarks that short, bdflush/kupdate can come in and screw the
results.  Also, when I create 100,000 files on my test box with these
mount parameters, it results in 3 large async transactions.

In data-logging-36, kreiserfsd will get those async commits to disk
sooner than in data-logging-35, which is the right thing to do because
it helps make sure later writes won't stall while we have to flush that
async transaction.

But for a very short benchmark that doesn't do more work later on, it
can seem slower.  If you want a more accurate picture, include the time
it takes to sync after creating all the files.

-chris