linux-kernel - RE: [PATCH 0/8][RFC] IO latency/throughput fixes

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Message-ID: <002501c9b6f3$f85b4910$e911db30$@com>
Date:	Mon, 6 Apr 2009 13:12:08 -0700
From:	"Hua Zhong" <hzhong@...il.com>
To:	"'Linus Torvalds'" <torvalds@...ux-foundation.org>,
	"'Theodore Tso'" <tytso@....edu>
Cc:	"'Jens Axboe'" <jens.axboe@...cle.com>,
	"'Linux Kernel Mailing List'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 0/8][RFC] IO latency/throughput fixes

Grr..making writeback as default would break people's setup that relies on
the ordered semantics, especially in the embedded world. It's a big no-no.

> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
> owner@...r.kernel.org] On Behalf Of Linus Torvalds
> Sent: Monday, April 06, 2009 12:57 PM
> To: Theodore Tso
> Cc: Jens Axboe; Linux Kernel Mailing List
> Subject: Re: [PATCH 0/8][RFC] IO latency/throughput fixes
> 
> 
> 
> On Mon, 6 Apr 2009, Theodore Tso wrote:
> >
> > Cool!  Maybe we can make things even better, but given where we are
> > at, this brings up an question: given Jens block latency patches
> > (thanks, Jens!), and the patches which add the flush on
> > replace-via-rename/replace-via-truncate for ext3 data=writeback,
> > should we make ext3 data=writeback the default for 2.6.30?
> 
> Yes. I want to go back and see how much this all helps for the
> data=ordered case (if at all), but I think we should at least consider
> trying 'data=writeback' as a default.
> 
> Does the 'synchronize on rename / close-after-ftrucate' patches leave
> any
> other intersting cases open?
> 
> 			Linus
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