System briefly freezes every time when a very large UFS directory is filled with files

[Wojciech Puchar]

do you have UFS_DIRHASH enabled in kernel.
without this you may expect huge slowdown and very low performance when 
accessing files from that directory.

On Wed, 19 Aug 2015, Julian Elischer wrote:

> On 8/19/15 3:41 AM, Yuri wrote:
>> 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.
> Try increase the size of the directory hash/cache.
>> 
>> 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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