From: Lubos Kolouch <lubos.kolouch@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: Re: extremely slow syncing on btrfs with 2.6.39.1
Date: Tue, 12 Jul 2011 07:52:54 +0000 (UTC) [thread overview]
Message-ID: <ivgugm$6i2$1@dough.gmane.org> (raw)
In-Reply-To: 4E1BF52E.9090100@mobileobjects.de
Jan Stilow, Tue, 12 Jul 2011 09:18:06 +0200:
> On 07/11/2011 02:18 AM, Kok, Auke-jan H wrote:
>> I've been monitoring the lists for a while now but didn't see this
>> problem mentioned in particular: I've got a fairly standard desktop
>> system at home, 700gb WD drive, nothing special, with 2 btrfs
>> filesystems and some snapshots. The system runs for days, and I've
>> noticed unusual disk activity the other evening - turns out that it's
>> taking forever to sync().
>>
>> $ uname -r
>> 2.6.39.1
>> $ grep btrfs /proc/mounts
>> /dev/root / btrfs rw,relatime 0 0 # is /dev/sdb2 # /dev/sdb5 /home
>> btrfs rw,relatime 0 0 $ time sync
>>
>> real 1m5.552s
>> user 0m0.000s
>> sys 0m2.102s
>>
>> $ time sync
>>
>> real 1m16.830s
>> user 0m0.001s
>> sys 0m1.490s
>>
>> $ df -h / /home
>> Filesystem Size Used Avail Use% Mounted on /dev/root 47G
>> 33G 7.7G 82% / /dev/sdb5 652G 216G 421G 34% /home $ btrfs fi
>> df /
>> Data: total=35.48GB, used=29.86GB
>> System, DUP: total=16.00MB, used=12.00KB System: total=4.00MB,
>> used=0.00
>> Metadata, DUP: total=4.50GB, used=1.67GB
>> $ btrfs fi df /home
>> Data: total=310.01GB, used=209.53GB
>> System, DUP: total=8.00MB, used=48.00KB System: total=4.00MB, used=0.00
>> Metadata, DUP: total=11.00GB, used=2.98GB Metadata: total=8.00MB,
>> used=0.00
>>
>> I'll switch to 3.0 soon, but, given the fact that we're going to be
>> running MeeGo on 2.6.39 probably for a while, I was wondering if anyone
>> knows off the top of their heads if this issue is known/identified. If
>> not then I'll need to make someone do some patching ;).
>>
>> Auke
>
> You should read the thread "Abysmal Performance" of these mailing list
> from last month. They had a similar problem and downgraded to a 2.6.38
> kernel. By the way, that works for me too for the time being.
>
> Best Regards.
>
> Jan Stilow
I had similar experience with two servers running on 2.6.39 - the
performance was terrible, after downgrade to 2.6.38 the speed is OK again.
Best regards
Lubos Kolouch
next prev parent reply other threads:[~2011-07-12 7:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-11 0:18 extremely slow syncing on btrfs with 2.6.39.1 Kok, Auke-jan H
2011-07-12 7:18 ` Jan Stilow
2011-07-12 7:52 ` Lubos Kolouch [this message]
2011-07-12 8:44 ` Li Zefan
2011-07-27 5:37 ` Lubos Kolouch
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