linux-kernel - Re: Poor interactive performance with I/O loads with fsync()ing

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Message-ID: <4bc1fa59.c5c2f10a.776d.ffffcd91@mx.google.com>
Date:	Sun, 11 Apr 2010 09:35:37 -0700 (PDT)
From:	Ben Gamari <bgamari.foss@...il.com>
To:	Avi Kivity <avi@...hat.com>, linux-btrfs@...r.kernel.org
Cc:	Andi Kleen <andi@...stfloor.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, tytso@....edu, npiggin@...e.de,
	mingo@...e.hu, Ruald Andreae <ruald.a@...il.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Olly Betts <olly@...vex.com>,
	martin f krafft <madduck@...duck.net>
Subject: Re: Poor interactive performance with I/O loads with fsync()ing

On Sun, 11 Apr 2010 18:03:00 +0300, Avi Kivity <avi@...hat.com> wrote:
> On 04/09/2010 05:56 PM, Ben Gamari wrote:
> > On Mon, 29 Mar 2010 00:08:58 +0200, Andi Kleen<andi@...stfloor.org>  wrote:
> >    
> >> Ben Gamari<bgamari.foss@...il.com>  writes:
> >> ext4/XFS/JFS/btrfs should be better in this regard
> >>
> >>      
> > I am using btrfs, so yes, I was expecting things to be better. Unfortunately,
> > the improvement seems to be non-existent under high IO/fsync load.
> >
> 
> btrfs is known to perform poorly under fsync.
> 
Has the reason for this been identified? Judging from the nature of metadata
loads, it would seem that it should be substantially easier to implement
fsync() efficiently.

- Ben

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