Am 04/15/12 15:59, schrieb Richard Kojedzinszky: > Thank you for the reply. > > Unfortunately, dont know why, but on my xen virtualised environment, > fbsd amd64 domU performs much slower, not only 30 times. Without > multilabel, file creation speed is around 2500/s, but with multilabels > enabled, it is only 15/s (!). so it is more than 100 times slower. > > And anyway freebsd is known to be fast as well, as functional. The power > to serve. :) > > But in my environment, 15/s file creation is very-very slow. The > hardware is a q6700 cpu with 4G ram, 2x1T sata disks in raid1, the host > runs linux. I think with this hw the mentioned speed is really slow. > > Regards, > > > Kojedzinszky Richard > Euronet Magyarorszag Informatikai Zrt. > > On Sun, 15 Apr 2012, O. Hartmann wrote: > >> Date: Sun, 15 Apr 2012 13:20:23 +0200 >> From: O. Hartmann <ohart...@zedat.fu-berlin.de> >> To: Richard Kojedzinszky <kri...@tvnetwork.hu> >> Cc: freebsd-secur...@freebsd.org >> Subject: Re: ufs multilabel performance (fwd) >> >> Am 04/14/12 21:37, schrieb 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 <kri...@tvnetwork.hu> >>> To: freebsd-performa...@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' >> >> Same here, creating files seems to be 10 - 30 times slower with >> multilabels as it is without. >> >> But as several posts and discussions reflects, FreeBSD isn't supposed to >> be fast although it is claimed that writing is the major than reading; >> FBSD should serve functionality. >>> >>> 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 >>> Fingerprint = F6D4 3FFE AF03 CACF 0DCB 46A1 54B2 BF0C 8F59 B1B7
At the moment, I'm troubled with a nasty kernel bug on all FreeBSD 10 boxes I have spare to test. I just tried to reproduce your observation and as far as I can go with my experience, I can confirm that by using your perl script. I'd like to test this again with a small C program. I can only test the issue (test is too far optimistic, it's simply a reproduction of your observation) on FreeBSD 10, the only remaining FreeBSD server at our department is running FBSD 9-STABLE/amd64 and "in production", so changing multilabel support is a bit harsh at the moment. Sorry about crossposting, but I think this belongs more to CURRENT and PERFORMANCE than SECURITY. Regards, Oliver
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