Re: [PATCH]sched: Isochronous class v2 for unprivileged soft rt scheduling

[Ingo Molnar]

* Con Kolivas <kernel@xxxxxxxxxxx> wrote:

> In terms of recommendation, the latency of non-preemptible codepaths
> will be fastest in ext3 in 2.6 due to the nature of it constantly
> being examined, addressed and updated. That does not mean it has the
> fastest performance by any stretch of the imagination. [...]

i agree with the latency observation. But ext3 got two significant
performance boosts recently, at two ends of the performance spectrum:

- in the (lots-of-)small-files area: the addition of the htree feature

- in the large-files-throughput case: with the addition of the
  reservation feature.

ext3 installed by a recent distro should have both features enabled. (i
know for sure that Fedora Core 3 with the update/erratum kernel
installed will create ext3 filesystems that utilize both of these
features by default.) 

I encourage everyone to try the famous 'create and read 1 million small
files' test on both recent ext3 and on other filesystems.

	Ingo
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