linux-kernel - Re: EXT4-ish "fixes" in UBIFS

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Date:	Thu, 2 Apr 2009 20:28:56 -0600
From:	"Trenton D. Adams" <trenton.d.adams@...il.com>
To:	David Rees <drees76@...il.com>
Cc:	Christian Kujau <lists@...dbynature.de>,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: EXT4-ish "fixes" in UBIFS

On Thu, Apr 2, 2009 at 8:19 PM, David Rees <drees76@...il.com> wrote:
> On Thu, Apr 2, 2009 at 7:05 PM, Trenton D. Adams
> <trenton.d.adams@...il.com> wrote:
>> On Thu, Apr 2, 2009 at 7:55 PM, David Rees <drees76@...il.com> wrote:
>>> On Thu, Apr 2, 2009 at 5:28 PM, Trenton D. Adams
>>> <trenton.d.adams@...il.com> wrote:
>> dirty_ratio and dirty_background never really had any affect for me.
>> I'll look into the other parameters.  Waiting for the checkout again,
>> as I am currently under a heavy rsync load (*rolls eyes*).
>
> How low have you set them?  Try setting them to 2 and 1 respectively.
> It cuts down fsync latencies by a significant amount in my experience.
>
> -Dave
>

That's the odd thing, I was setting them to 2 and 1.  I was just
looking at the 2.6.29 code, and it should have made a difference.  I
don't know what version of the kernel I was using at the time.  And,
I'm not sure if I had the 1M fsync tests in place at the time either,
to be sure about what I was testing.  It could be that I wasn't being
very scientific about it at the time.  Thanks though, that setting
makes a huge difference.
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