linux-ext4 - Re: [GIT PULL] Ext3 latency fixes

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Date:	Sat, 4 Apr 2009 11:10:03 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jens Axboe <jens.axboe@...cle.com>
cc:	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

On Sat, 4 Apr 2009, Jens Axboe wrote:
> 
> > Also, I may be odd, but I really do think latency is more important than 
> > throughput. When my disk has latencies in the sub-milliseconds, I simply 
> > do not think it is _acceptable_ to have hickups that affect my workload in 
> > human-visible terms. 
> 
> Not everyone has an Intel SSD.

The thing is, I know for a fact that the hickups were much worse _before_ 
I had the Intel SSD.

With the SSD, I have to work a lot more to get them. Back when I had 
regular rotational disks, I definitely did not need to do any 2GB file 
creation at all. Just standard "yum update" would make my mail reader 
pause.

Yeah, it's just for a short time, but it's very annoying. One second is 
quite noticeable when I type something, and it doesn't show up on the 
screen ("What? My Nehalem cannot keep up with my _typing_?"). 2-3 seconds 
it really feels bad. And by the time it takes 5+ seconds, I start moving 
my mouse around just to see whether the computer crashed.

		Linus
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