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Date:      Wed, 19 Aug 2015 11:01:52 +0200 (CEST)
From:      Wojciech Puchar <wojtek@puchar.net>
To:        Yuri <yuri@rawbw.com>
Cc:        Freebsd hackers list <freebsd-hackers@FreeBSD.org>
Subject:   Re: System briefly freezes every time when a very large UFS directory is filled with files
Message-ID:  <alpine.BSF.2.20.1508191101290.5872@laptop.wojtek.intra>
In-Reply-To: <55D38A75.6090508@rawbw.com>
References:  <55D38A75.6090508@rawbw.com>

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> I have one directory that has ~1.2M files on UFS system.
> Every time when the process that creates files there reaches a particular 
> point (~0.9M files), system invariably freezes for ~10 seconds, after which 
> it continues and process succeeds.

how large is your
vfs.ufs.dirhash_maxmem



>
> I know that this is quite an extreme number of files but, other than this 
> problem, it is usable in this setup.
>
> Maybe someone can think of some fix or the immediate reason of such freezes? 
> This isn't a good problem to have, even in the view of an extremity of this 
> situation.
>
> Yuri
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