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

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Date:	Fri, 13 Sep 2013 09:35:05 +0300
From:	Marcus Sundman <marcus@...ox.fi>
To:	Jan Kara <jack@...e.cz>
CC:	Theodore Ts'o <tytso@....edu>, Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Debugging system freezes on filesystem writes

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?


- Marcus

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