From: Josef Bacik <josef@redhat.com>
To: Henning Rohlfs <x+btrfs@xehonk.de>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: Abysmal Performance
Date: Mon, 20 Jun 2011 20:12:16 -0400 [thread overview]
Message-ID: <4DFFE1E0.4040601@redhat.com> (raw)
In-Reply-To: <7da312412980843ba746e4e8809060f8@localhost>
On 06/20/2011 05:51 PM, Henning Rohlfs wrote:
> Hello,
>
> I've migrated my system to btrfs (raid1) a few months ago. Since then
> the performance has been pretty bad, but recently it's gotten
> unbearable: a simple sync called while the system is idle can take 20 up
> to 60 seconds. Creating or deleting files often has several seconds
> latency, too.
>
> One curious - but maybe unrelated - observation is that even though I'm
> using a raid1 btrfs setup, the hdds are often being written to
> sequentially. One hard-drive sees some write activity and after it
> subsides, the other drive sees some activity. (See attached
> sequential-writes.txt.)
>
Can you do sysrq+w while this is happening so we can see who is doing
the writing? Thanks,
Josef
next prev parent reply other threads:[~2011-06-21 0:12 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-20 21:51 Abysmal Performance Henning Rohlfs
2011-06-21 0:12 ` Josef Bacik [this message]
2011-06-21 7:10 ` Henning Rohlfs
2011-06-21 8:00 ` Sander
2011-06-21 9:26 ` Henning Rohlfs
2011-06-21 15:18 ` Josef Bacik
2011-06-21 16:55 ` Henning Rohlfs
2011-06-21 15:24 ` Calvin Walton
2011-06-22 14:15 ` Henning Rohlfs
2011-06-22 15:39 ` Josef Bacik
2011-06-22 15:57 ` Calvin Walton
2011-06-22 15:58 ` Josef Bacik
-- strict thread matches above, loose matches on Subject: below --
2011-04-29 14:46 abysmal performance John Wyzer
2011-04-29 15:01 ` Chris Mason
2011-04-30 17:33 ` Mitch Harder
2011-04-30 20:40 ` John Wyzer
2011-04-30 22:16 ` Mitch Harder
2011-04-30 22:33 ` John Wyzer
2011-05-03 11:05 ` Chris Mason
2011-05-03 11:06 ` Chris Mason
2011-04-30 23:55 ` Peter Stuge
2011-05-03 10:33 ` Bernhard Schmidt
2011-05-03 11:00 ` cwillu
2011-05-03 11:26 ` Bernhard Schmidt
2011-05-03 11:08 ` Chris Mason
2011-05-03 11:30 ` Bernhard Schmidt
2011-05-03 11:36 ` Chris Mason
2011-05-03 11:43 ` Bernhard Schmidt
2011-05-03 12:52 ` Chris Mason
2011-05-03 13:03 ` Bernhard Schmidt
2011-05-03 13:41 ` Mitch Harder
2011-05-03 14:41 ` Daniel J Blueman
2011-05-03 15:42 ` Mitch Harder
2011-05-03 16:51 ` Chris Mason
2011-05-03 14:54 ` Daniel J Blueman
2011-05-03 15:10 ` Bernhard Schmidt
[not found] ` <1304100271-sup-4177@localhost>
[not found] ` <1304100862-sup-1493@think>
[not found] ` <1304107977-sup-3815@localhost>
[not found] ` <1304110058-sup-7292@think>
[not found] ` <1304146193-sup-2200@localhost>
2011-04-30 20:51 ` John Wyzer
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