From mboxrd@z Thu Jan  1 00:00:00 1970
From: Josef Bacik <josef@redhat.com>
Subject: Re: bonnie triggers and endless numbers of stack traces
Date: Fri, 19 Aug 2011 15:36:55 -0400
Message-ID: <4E4EBB57.3040209@redhat.com>
References: <j2m3ud$u8e$1@dough.gmane.org>
Mime-Version: 1.0
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Cc: linux-btrfs@vger.kernel.org
To: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Return-path: <linux-btrfs-owner@vger.kernel.org>
In-Reply-To: <j2m3ud$u8e$1@dough.gmane.org>
List-ID: <linux-btrfs.vger.kernel.org>

On 08/19/2011 12:45 PM, Bernd Schubert wrote:
> Just for performance tests I run:
> 
> ./bonnie++ -d /mnt/btrfs -s0 -n 1:256:256:1 -r 0
> 
> and this causes and endless number of stack traces. Those seem to 
> come from:
> 
> use_block_rsv()
> 
> 	ret = block_rsv_use_bytes(block_rsv, blocksize);
> 	if (!ret)
> 		return block_rsv;
> 	if (ret) {
> 		WARN_ON(1);
> 		ret = reserve_metadata_bytes(trans, root, block_rsv, blocksize,
> 
> 
> Why is there a WARN_ON(1)? Running the bonnie benchmark is basically impossible
> that.

This is being worked on, if you really don't like it pull my git tree
and test it out and see if the errors go away

git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs-work.git

Thanks,

Josef