linux-kernel - Re: [GIT PULL] Ext3 latency fixes

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Date:	Tue, 07 Apr 2009 09:31:37 -0400
From:	Mark Lord <lkml@....ca>
To:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>
Cc:	Ingo Molnar <mingo@...e.hu>, Jens Axboe <jens.axboe@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [GIT PULL] Ext3 latency fixes

Lennart Sorensen wrote:
> On Sat, Apr 04, 2009 at 10:18:20PM +0200, Ingo Molnar wrote:
>> btw., just to insert some hard data: usability studies place the 
>> acceptance threshold for delays to around 300 milliseconds.
>>
>> If the computer does not 'respond' (in a real or a fake, visible or 
>> audible way) to their input within 0.3 seconds they get annoyed 
>> emotionally.
> 
> You mean like hitting 'skip commercial' on the remote, and 2 minutes later
> when the commercials are almost over, then it happens.  Yeah users get a
> bit peeved at that.  Fortunately that particularly behaviour is somewhat
> rare.  5 to 10 seconds is more common and sometimes it works fine.
..

I generally don't see any delay at all when doing that,
even when the Mythtv system is very busy on multiple recordings.
But then, I also don't use the huge LIRC stack for the simple R/C either.

cheers
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