From: Martin Steigerwald <Martin@lichtvoll.de>
To: "Swâmi Petaramesh" <swami@petaramesh.org>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: Rebalance makes BTRFS 10x slower
Date: Sun, 23 Mar 2014 16:12:07 +0100 [thread overview]
Message-ID: <7616233.4PhybLsPIr@merkaba> (raw)
In-Reply-To: <4392627.HWimVooIO4@tethys>
Am Sonntag, 23. März 2014, 15:51:34 schrieben Sie:
> I was expecting either a speed improvement after rebalance, or no
> noticeable effect, but I am extremely disappointed to see that now (and
> after having rebooted), my system has become slow like hell, takes at least
> 10x longer to boot and operate, to the point it has become hardly usable
>
> I would have thought a rebalance would have improved the filesystem
> organization, looks like it's the absolute contrary
I also found this to be the case as I rebalanced the root filesystem of my
Debian installation on this ThinkPad T520 on an Intel SSD 320.
It doubled the boot time that systemd-analayze rebootet back then.
apt-get dist-upgrade was noticably slower to.
Thus I avoid balance unless I really need it.
For migrating of /home to BTRFS RAID 1 on Intel SSD 320 + Crucial mSATA M500
SSD I did a balance to switch to RAID 1. Probably /home would be faster
recreating it from scratch and restoring from backup tough.
Especially MySQL based Akonadi seems to be slower than with /home on a single
SSD, but that might also be due to that amount of mails in Linux kernel-ml
folder raising to a high amount (and inefficiencies in Akonadi).
--
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7
next prev parent reply other threads:[~2014-03-23 15:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-23 14:51 Rebalance makes BTRFS 10x slower Swâmi Petaramesh
2014-03-23 15:12 ` Martin Steigerwald [this message]
2014-04-13 14:16 ` Clemens Eisserer
2014-04-13 20:46 ` Duncan
2014-04-16 15:00 ` Clemens Eisserer
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