linux-kernel - Re: [PATCH] reiserfs: kill-the-BKL

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Message-ID: <20090410130735.GC31307@elte.hu>
Date:	Fri, 10 Apr 2009 15:07:35 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Bron Gondwana <brong@...tmail.fm>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jeff Mahoney <jeffm@...e.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	ReiserFS Development List <reiserfs-devel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] reiserfs: kill-the-BKL


* Bron Gondwana <brong@...tmail.fm> wrote:

> > For example, if you have /home and / on separate reiser3 
> > filesystems, you could see as much as a 200% jump in performance 
> > straight away on certain workloads, on a dual-core box.
> > 
> > That big BKL overhead is a real reiser3 scalability problem - 
> > especially on reiser3 using servers which are likely to have 
> > several filesystems on the same box.
> 
> Yes - I'm certainly interested in that.
> 
> That said, we have a box with 83 reiserfs partitions on it, and 
> which is constrained by IO (main servers really don't need much 
> CPU).  Performance is pretty good even now.
> 
> So - I'm interested in this patch series, but not at the expense 
> of making reiserfs any less stable.  Our customers, funnily 
> enough, like it when our service is stable!

Definitely so :-)

	Ingo
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