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

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Message-ID: <9b1675090904021728y35776377u327f2266d06e2f29@mail.gmail.com>
Date:	Thu, 2 Apr 2009 18:28:47 -0600
From:	"Trenton D. Adams" <trenton.d.adams@...il.com>
To:	Christian Kujau <lists@...dbynature.de>
Cc:	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 6:24 PM, Trenton D. Adams
<trenton.d.adams@...il.com> wrote:
> On Thu, Apr 2, 2009 at 6:09 PM, Christian Kujau <lists@...dbynature.de> wrote:
>> On Fri, 27 Mar 2009, Artem Bityutskiy wrote:
>>> They just say - this is file-system bug, it is fixed in
>>> ext4 now, just fix the bug in UBIFS.
>>
>> Would *mounting* the filesystem with "-o sync" help? This way no
>> filesystem "fixes" are needed and userland would not have to be rewritten.
>>
>> Christian.
>
> Yes, mounting "-o sync" does improve ext3 performance.  It sucks
> though, because I do want quick writes.  And mounting with sync option
> slows down to disk io speeds.  In my case, that's between 20 and 23
> megabytes per second *big frown, quivering lip, and tears in my eyes*.
> :P
>

Oh, I should have clarified.  It improves performance under heavy
load.  Under normal load, mounting without sync is fine.  What I tend
to do is mount with "remount,rw,sync" when heavy load is starting.
Then my system goes slowly, but latency is good.  Then, when it's all
done (say a big compile, or job, or whatever), I remount without sync
again.

I'm thinking of writing a script that monitors performance, and
remounts as needed, lol.  WHAT A HACK. hehe.
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