From: Kai Krakow <hurikhan77+btrfs@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: Re: Why does btrfs benchmark so badly in this case?
Date: Fri, 09 Aug 2013 23:35:33 +0200 [thread overview]
Message-ID: <8u3gda-evs.ln1@hurikhan77.spdns.de> (raw)
In-Reply-To: 20130808203855.GI16712@localhost.localdomain
Josef Bacik <jbacik@fusionio.com> schrieb:
>> So I guess the reason that ZFS does well with that workload is that
>> ZFS is using smaller blocks, maybe just 512B ?
>
> Yeah I'm not sure what ZFS does, but if you are writing over a block and
> the size/offset isn't aligned then you'd see similar issues with ZFS since
> it would
> have to read+modify+write. It is likely that ZFS just is using a smaller
> blocksize.
>From what I remember, ZFS uses dynamic block sizes. However, block size can
be forced and thus tuned for workloads that require it:
http://www.joyent.com/blog/bruning-questions-zfs-record-size
Maybe that's the reason...
It would be interesting to see how the benchmarks performed with forced
block size.
Regards,
Kai
next prev parent reply other threads:[~2013-08-09 21:35 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-08 16:13 Why does btrfs benchmark so badly in this case? John Williams
2013-08-08 17:29 ` Josef Bacik
2013-08-08 18:37 ` Clemens Eisserer
2013-08-08 19:40 ` Josef Bacik
2013-08-08 20:23 ` John Williams
2013-08-08 20:38 ` Josef Bacik
2013-08-09 21:35 ` Kai Krakow [this message]
2013-08-12 13:48 ` Josef Bacik
2013-08-08 20:59 ` Chris Murphy
2013-08-08 21:25 ` Zach Brown
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