linux-kernel - Re: Linux 2.6.29

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Message-ID: <49CE109F.70603@ursus.ath.cx>
Date:	Sat, 28 Mar 2009 12:57:19 +0100
From:	"Andreas T.Auer" <andreas.t.auer_lkml_73537@...us.ath.cx>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Mark Lord <lkml@....ca>, Jeff Garzik <jeff@...zik.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29



On 28.03.2009 03:38 Linus Torvalds wrote:
> On Fri, 27 Mar 2009, Mark Lord wrote:
>  
>> Okay, I'll bite.  Exactly which version of FF has that variable?
>> Cuz it ain't in the FF 3.0.8 that I'm running here.
>>    
>
> I'd suspect that I mistyped it, but I just cut-and-pasted it from my
email
> to make sure. Maybe you did. What happens if you just write "sync" in the
> Filter: box? Nothing matches?
>
>  
No, not with my iceweasel 3.0.7 (Debian/testing).

I couldn't find anything in the Debian patch to the source code, but the
source code contains
toolkit/components/contentprefs/src/nsContentPrefService.js 733-746:

    // Turn off disk synchronization checking to reduce disk churn and
speed up
    // operations when prefs are changed rapidly (such as when a user
repeatedly
    // changes the value of the browser zoom setting for a site).
    //
    // Note: this could cause database corruption if the OS crashes or
machine
    // loses power before the data gets written to disk, but this is
considered
    // a reasonable risk for the not-so-critical data stored in this
database.
    //
    // If you really don't want to take this risk, however, just set the
    // toolkit.storage.synchronous pref to 1 (NORMAL synchronization) or 2
    // (FULL synchronization), in which case
mozStorageConnection::Initialize
    // will use that value, and we won't override it here.
    if (!this._prefSvc.prefHasUserValue("toolkit.storage.synchronous"))
      dbConnection.executeSimpleSQL("PRAGMA synchronous = OFF");

Probably they preferred the default value "off" so much that they even
dropped the entry in standard configuration.
> Do you see firefox pausing a lot under disk load?
I see iceweasel pausing/blocking a lot when loading stalling webpages,
but that's a different topic.



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