On 12 April 2010 13:47, Dirk Hohndel <hohndel@infradead.org> wrote:
> On Mon, 12 Apr 2010 10:14:05 -0700, Stewart Smith <stewart@flamingspork.com> wrote:
>> On Mon, 12 Apr 2010 17:24:35 +0200, "Sebastian Spaeth" <Sebastian@SSpaeth.de> wrote:
>> > What I find intersting is that we have a 2x speedup and a 10x speedup
>> > for different queries. Olly was saying on IRC that both *should* really be
>> > behaving in much the same manner.
>>
>> Remember that on ext3 (and pretty sure ext4) fsync is the same as
>> sync(). So performance depends on how much dirty data you have in your cache.
>>
>> libeatmydata also gets rid of msync(), O_SYNC etc as well.
>
> Which is why so many of us have started to use BTRFS...

How stable is it now? What kernel version and distro are you using?

Servilio