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Date: Thu, 25 Aug 2005 23:25:23 +0200
From: Marian Hettwer <MH@kernel32.de>
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To: Mike Tancsa <mike@sentex.net>
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Cc: freebsd-current@freebsd.org
Subject: Re: filesystem performance with lots of small files
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Hi Mike,

Mike Tancsa wrote:
> At 01:58 PM 25/08/2005, Marian Hettwer wrote:
>=20
>> couldn't find any sysctl'=C2=B4s or kernel parameters.
>> I'll report numbers, as soon as I have them.
>> And yes, I disabled the debugging features in my kernel (WITNESS,=20
>> INVARIANTS ...)
>> Besides, I know that 6-BETA is not about performance at all :)
>>
>> any tips on file system performance with small files, though ?
>=20
>=20
> It might be hitting the dirhash max mem value.  What does=20
> vfs.ufs.dirhash_maxmem and vfs.ufs.dirhash_mem show ?
>=20
I didn't changed anything from the defaults... it looks like that:
mhettwer@submaster-test$ sysctl vfs.ufs.dirhash_maxmem
vfs.ufs.dirhash_maxmem: 2097152
mhettwer@submaster-test$ sysctl vfs.ufs.dirhash_mem
vfs.ufs.dirhash_mem: 368622

By the way, the copy job of my small files finished, so here we go with=20
some small facts :)
mhettwer@submaster-test$ sudo time find /usr/tmp/ | wc -l
       133.81 real         2.01 user         3.95 sys
  2904696

nearly three million files. quite a lot ...

regards,
Marian