ufs multilabel performance (fwd)

[Richard Kojedzinszky]

Dear list,

Although it is not only security-related question, I did not get any 
answer from freebsd-performance. The original question is below.

Can someone give some advice?

Thanks in advance,


Kojedzinszky Richard
Euronet Magyarorszag Informatikai Zrt.

---------- Forwarded message ----------
Date: Thu, 10 Nov 2011 06:16:57 +0100 (CET)
From: Richard Kojedzinszky <krichy at tvnetwork.hu>
To: freebsd-performance at freebsd.org
Subject: ufs multilabel performance

Dear List,

I've noticed that when I enable multilabel on an fs, a file creation gets 
around 20-30 times slower than without multilabel set.

This one-liner can be used to test the differences:
$ truss -D perl -e 'open(F, ">$_.file") for 1 .. 1000'

And one can see that the open call takes much more when multilabel is set on an 
fs. It seems that only file creation needs that many time, when a file exists 
it is opened much faster.

Could someone acknowledge this, and have some suggestions how to make it 
faster?

Regards,


Kojedzinszky Richard
TvNetWork Nyrt.
E-mail: krichy (at) tvnetwork [dot] hu
PGP: 0x54B2BF0C8F59B1B7
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