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Date:	Mon, 30 Jan 2012 16:36:12 +0100
From:	Cédric Villemain 
To:	Eric Whitney <>
Cc:	Ext4 Developers List <>,
Subject: Re: 3.2 and 3.1 filesystem scalability measurements

Le 30 janvier 2012 05:09, Eric Whitney <> a écrit :
> I've posted the results of some 3.2 and 3.1 ext4 scalability measurements
> and comparisons on a 48 core x86-64 server at:
> This includes throughput and CPU efficiency graphs for five simple
> workloads, the raw data for same, plus lockstats on ext4 filesystems with
> and without journals.  The data have been useful in improving ext4
> scalability as a function of core and thread count in the past.
> For reference, ext3, xfs, and btrfs data are also included.

interesting to have all of them, yes.

> The most notable improvement in 3.2 is a big scalability gain for journaled
> ext4 when running the large_file_creates workload.  This bisects cleanly to
> Wu Fengguang's IO-less balance_dirty_pages() patch which was included in the
> 3.2 merge window.
> (Please note that the test system's hardware and firmware configuration has
> changed since my last posting, so this data set cannot be directly compared
> with my older sets.)
> Thanks,
> Eric
> --
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Cédric Villemain +33 (0)6 20 30 22 52
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