Date: Wed, 27 Oct 1999 12:05:50 -0400 (EDT) From: Chuck Youse <cyouse@paradox.nexuslabs.com> To: Ilia Chipitsine <ilia@cgilh.chel.su> Cc: questions@FreeBSD.ORG, hackers@FreeBSD.ORG Subject: Re: why FFS is THAT slower than EXT2 ? Message-ID: <Pine.BSF.4.10.9910271158590.1849-100000@paradox.nexuslabs.com> In-Reply-To: <Pine.BSF.4.10.9910272118130.390-101000@localhost.cgu.chel.su>
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One of the biggest reasons for the difference: FreeBSD, by default, performs _synchronous_ metadata updates, and Linux performs asynchronous metadata updates. It's definitely a bit slower, but the payoff is in reliability. I have seen more than one [production!] Linux machine completely trash its filesystems because the implementors decided that their "NT-killer" must have good performance at the expense of serious, production-quality reliability. Chuck On Wed, 27 Oct 1999, Ilia Chipitsine wrote: > -----BEGIN PGP SIGNED MESSAGE----- > > Well, guys, listen :-) > > I and my friends mentioned that "FreeBSD + ffs" is often slower > (THAT slower) than "Linux + ext2" for number of tasks: > rm, find, tar ... for IDE & SCSI disks. > > I didn't try things like "FreeBSD + ext2" or "Linux + ffs". > > I attached here results of the test I performed. For test I "gunzip"ped > FreeBSD ports collection, in attachment You can find "scripted" output of > "# time sh install.sh" for both systems. Also there are "dmesg" outputs. > > machine was THE SAME: read "dmesg", > > FreeBSD-3.3 + softupdates + "# tunefs -o time" + "flags 0xb0ffb0ff" > (kernel was compiled with "-O2") > Linux - RedHat-6.0 with out_of_box_kernel, just > "# hdparm -d 1 -c 3 -m 16 /dev/hda", read "hdparm" output... > > even as non-native English speaker I know few other other words which > begin with "f" :-) > is "fast" the propriate one for "ffs" ? > > Regards, (Наилучшие пожелания) > > Ilia Chipitsine (Илья Шипицин) > > -----BEGIN PGP SIGNATURE----- > Version: 2.6.3ia > Charset: noconv > > iQB1AwUBOBcbQuRxlWKN2EXhAQHHqgL+K+2O8gkv1kYs8AhsqbMsIFTG5u7gfzcT > oqqhKlTUlTtaKtAl6g/CnKsPpxfh0CaMEmQC+5bzqSa4MnZcyHwiAWlrNLRlU08A > DfYJQRGa/6S5OiaJVYnsAuKnbr6tLZGZ > =YWer > -----END PGP SIGNATURE----- > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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