Re: btrfs-ino-cache is running on each reboot

[dima <dolenin@parallels.com>]

On 08/13/2013 01:09 PM, Duncan wrote:
> dima posted on Tue, 13 Aug 2013 10:28:59 +0900 as excerpted:
>
>> About a week or so ago I noticed that [btrfs-ino-cache] process was
>> appearing in the 'top' on each reboot and disk is spinning like crazy
>> for about five minutes or so. Quite so often this caused X failing to
>> start because all I/O was busy with caching.
>> Even after letting it to calm down and seeing [btrfs-ino-cache]
>> disappearing from the process list, on next reboot it starts all over
>> again.
>
>> inode_cache was always enabled since the FS was created about a year or
>> so ago, and actually I have never had any problems with it up until
>> recently.
>>
>> Removing inode_cache option from fstab solves the problem, but I am not
>> sure if it is the right choice.
>
> A number of people have reported problems with inode_cache enabled, and
> the recommendation has always been to turn it off "unless you need it".
> Easy enough problem to fix, I guess. =:^)
>
> Of course that immediately invites the question of why have the option at
> all if all it does is cause trouble, and (as a user not a dev) I don't
> have the answer to that.  I don't know the use case when "unless you need
> it" would actually apply, but apparently, it does in some cases.
>
> I guess the wiki[1] should really have a warning on that option, but
> without a more solid reason than "just don't turn it on, causes more
> trouble than it's worth", I'd feel kind of goofy adding it.
>
> Anyway, yes, the general recommendation on the list at this point seems
> to be to simply leave inode_cache off and not worry about it.


Thanks Duncan. So I did.
I was just wondering why it stopped behaving all of a sudden.



> ---
> [1] https://btrfs.wiki.kernel.org/
>