From: Goffredo Baroncelli <kreijack@gmail.com>
To: "Swâmi Petaramesh" <swami@petaramesh.org>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: BTRFS, getting darn slower everyday
Date: Mon, 08 Oct 2012 18:46:23 +0200 [thread overview]
Message-ID: <5073035F.6000600@gmail.com> (raw)
In-Reply-To: <5072F63B.5060608@petaramesh.org>
On 10/08/2012 05:50 PM, Swâmi Petaramesh wrote:
> Hi again Goffredo,
>
> Le 08/10/2012 13:38, Goffredo Baroncelli a écrit :
>> I fear that both the combination of autodefrag and the high number of
>> snapshot could be the root-cause of the the bad performance.
> I've removed, on one of my machines, all snapshots but three per subvol
> (keeping the oldests and newest), going from about 30 per subvol to 3,
> for the complete filesystem from 120+ to about a dozen.
>
> Then I let btrfs-cleaner do its job
>
> After that the machine boots to GUI in a bit less than 2 minutes, where
> it was more than 4 minutes previously.
>
> The machine now seems much more reactive and swift.
>
> So it seems that the number or active snapshots (or is it the number of
> subvols whatsoever ??) dramatically impacts performance...
Does the autodefrag options still alive ?
I believe that the snapshot is quite cheap, except if you update the
shared files one at time. Which should be the case of the autodefrag.
But it is only a my supposition....
Could you please try to avoid the autodefrag option in a machine with an
high number of snapshot ? I am curios...
>
> Thanks for the suggestion.
>
next prev parent reply other threads:[~2012-10-08 16:46 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-07 9:26 BTRFS, getting darn slower everyday Swâmi Petaramesh
2012-10-07 10:59 ` Martin Steigerwald
2012-10-07 14:05 ` Swâmi Petaramesh
2012-10-07 14:48 ` Martin Steigerwald
2012-10-08 6:16 ` Swâmi Petaramesh
2012-12-09 5:17 ` Jan Engelhardt
2012-12-09 10:13 ` Martin Steigerwald
2012-12-09 10:41 ` Roman Mamedov
2012-12-09 11:20 ` Swâmi Petaramesh
2012-12-09 11:38 ` Hugo Mills
2012-12-09 22:51 ` Bob Marley
2012-12-09 14:38 ` Jan Engelhardt
2012-10-07 11:02 ` Martin Steigerwald
2012-10-07 12:33 ` Alex
2012-10-07 13:19 ` Swâmi Petaramesh
2012-10-07 14:44 ` Martin Steigerwald
2012-10-07 22:47 ` Goffredo Baroncelli
2012-10-08 6:08 ` Swâmi Petaramesh
2012-10-08 11:38 ` Goffredo Baroncelli
2012-10-08 13:36 ` Swâmi Petaramesh
2012-10-08 15:50 ` Swâmi Petaramesh
2012-10-08 16:46 ` Goffredo Baroncelli [this message]
2012-10-08 6:22 ` Swâmi Petaramesh
2012-11-14 16:17 ` Peter Maloney
2012-10-07 13:00 ` Martin Steigerwald
2012-10-07 13:14 ` Swâmi Petaramesh
2012-10-07 14:41 ` Martin Steigerwald
2012-10-08 16:09 ` Josef Bacik
2012-10-08 16:15 ` Swâmi Petaramesh
2012-10-08 16:31 ` Josef Bacik
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