linux-kernel - Re: Debugging system freezes on filesystem writes

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Message-ID: <20130913205415.GA10668@quack.suse.cz>
Date:	Fri, 13 Sep 2013 22:54:15 +0200
From:	Jan Kara <jack@...e.cz>
To:	Marcus Sundman <marcus@...ox.fi>
Cc:	Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Debugging system freezes on filesystem writes

On Fri 13-09-13 09:35:05, Marcus Sundman wrote:
> On 12.09.2013 23:46, Jan Kara wrote:
> >On Thu 12-09-13 20:59:07, Marcus Sundman wrote:
> >>On 12.09.2013 19:35, Jan Kara wrote:
> >>>On Thu 12-09-13 18:08:13, Marcus Sundman wrote:
> >>>>And can I somehow "reset" whatever it is that is making it worse so
> >>>>that it becomes good again? That way I could spend maybe 1 hour once
> >>>>every few months to get it back to top speed.
> >>>>Any other ideas how I could make this (very expensive and fairly new
> >>>>ZenBook) laptop usable?
> >>>   Well, I believe if you used like 70% or less of the disk and regularly
> >>>(like once in a few days) run fstrim command, I belive the disk performance
> >>>should stay at a usable level.
> >>At 128 GB it is extremely small as it is, and I'm really struggling
> >>to fit all on it. Most of my stuff is on my NAS (which has almost 10
> >>TB space), but still I need several code repositories and the
> >>development environment and a virtual machine etc on this tiny 128
> >>GB thing.
> >   I see. I have like 70 GB disk and 50% of it are free :) But I have test
> >machines with much larger drives where I have VMs etc. This one is just
> >for email and coding.
> >
> >>So, if I used some other filesystem, might that allow me to use a
> >>larger portion of the SSD without this degradation? Or with a much
> >>slower rate of degradation?
> >   You might try f2fs. That is designed for low end flash storage so it
> >might work better than ext4. But it is a new filesystem so backup often.
> >
> >>And at some point it will become unusable again, so what can I do
> >>then? If I move everything to my NAS (and maybe even re-create the
> >>filesystem?) and move everything back, might that get rid of the FTL
> >>fragmentation?
> >   Yes, that should get rid of it. But since you have only a few GB free,
> >I'm afraid the fragmentation will reappear pretty quickly. But I guess it's
> >worth a try.
> >
> >>Or could I somehow defragment the FTL without moving away everything?
> >   I don't know about such way.
> 
> How about triggering the garbage collection on the drive, is that possible?
  No, I don't know about any way to do that.

								Honza

-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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