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Date: Tue, 8 Oct 2002 19:36:12 -0400
From: Benjamin LaHaise <bcrl@redhat.com>
To: Neil Brown <neilb@cse.unsw.edu.au>
Cc: mingo@redhat.com, Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch] silence an unnescessary raid5 debugging message
Message-ID: <20021008193612.H15858@redhat.com>
References: <20021008180350.A15858@redhat.com> <15779.27330.284336.914423@notabene.cse.unsw.edu.au>
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In-Reply-To: <15779.27330.284336.914423@notabene.cse.unsw.edu.au>; from neilb@cse.unsw.edu.au on Wed, Oct 09, 2002 at 09:31:14AM +1000
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On Wed, Oct 09, 2002 at 09:31:14AM +1000, Neil Brown wrote:
> This is there as a 'printk' deliberately.  It warns you that what you
> are doing isn't really supported and will cause a substantial
> performance hit (as all IO to the array is completely serialised
> around one of these messages).

As it stands, the syslogging from the printk does more damage to performance 
than the underlying problem.  Besides, LVM snapshots are slow, but they're 
useful for a class of problems anyways.

		-ben
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