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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 2 Apr 2009 18:54:14 -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 6:38 PM, Christian Kujau <lists@...dbynature.de> wrote:
> On Thu, 2 Apr 2009, Trenton D. Adams wrote:
>> 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.
>
> Really? How does mounting with "-o sync" *improve* performance? I am
> certainly aware that mounting with "-o sync" has severe performance
> impacts, but was proposing it anyway *only* to tackle the data integrity
> problem. However, I'm curious if usescaes in the embedded world are
> equally affected by this.
>

Oh, well for my system, if I do heavy IO, my *fsync* performance drops
like a rock.  fsync on even 1M takes 15-20 seconds at times.  I have
even seen 50 seconds.  If I mount with sync option, the fsyncs of 1M
take only a couple hundred milliseconds, while the other heavy IO is
happening.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/