Date: Wed, 19 Dec 2007 15:14:42 -0500 From: Mike Tancsa <mike@sentex.net> To: "Alexandre Biancalana" <biancalana@gmail.com> Cc: freebsd-performance@freebsd.org Subject: Re: Bad performance when accessing a lot of small files Message-ID: <200712192014.lBJKEfpY018975@lava.sentex.ca> In-Reply-To: <8e10486b0712191207r5e256b84xf6cb0bbafc6cfd20@mail.gmail.co m> References: <8e10486b0712191109n3d21b02cyf5183ee0cd01d8ce@mail.gmail.com> <200712191942.lBJJgWmJ018860@lava.sentex.ca> <8e10486b0712191207r5e256b84xf6cb0bbafc6cfd20@mail.gmail.com>
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At 03:07 PM 12/19/2007, Alexandre Biancalana wrote:
>On 12/19/07, Mike Tancsa <mike@sentex.net> wrote:
> > At 02:09 PM 12/19/2007, Alexandre Biancalana wrote:
> >
> > >The behavior that I'm observing and that want your help is when the
> > >system is accessing some directory with many small files ( directories
> > >with ~ 1 million of ~30kb files), the performance is very poor.
> >
> > Hi,
>
>I'm using zfs, I think this change the things.. no ?
Hmmm, I dont know. Quite possibly / probably. Based on your values
below, its not hitting the max if it were effected. I dont know
anything about ZFS to know if there is some specific tuning that
needs to be done for many files :(
---Mike
> > Have you adjusted the dirhash value ? What does
> >
> > sysctl -a vfs.ufs | grep dirhash
>
># sysctl -a vfs.ufs | grep dirhash
>vfs.ufs.dirhash_docheck: 0
>vfs.ufs.dirhash_mem: 1410338
>vfs.ufs.dirhash_maxmem: 2097152
>vfs.ufs.dirhash_minsize: 2560
>
>
> >
> > show on your box ? Also, do you have a lot of UIDs in your passwd file ?
>
>No.
>
># wc -l /etc/passwd
> 45 /etc/passwd
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