Date: Thu, 19 Apr 2001 08:57:37 -0700 From: "Jeremiah Gowdy" <data@dualcpus.com> To: <freebsd-hackers@FreeBSD.ORG> Subject: OpenBSD's FFS/dirpref/softupdates improvements Message-ID: <002101c0c8e9$759443c0$015778d8@sherline.net>
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"Two aspects of the FFS filesystem in OpenBSD have received significant improvements since 2.8, increasing performance dramatically. Thanks to art, gluk, csapuntz, and a host of other developers and testers, Soft Updates are now much more stable than ever before. The second improvement, contributed by gluk@openbsd.org, is a new directory allocation policy (codenamed "dirpref"). Coupled with soft updates, the new dirpref code offers up to a 60x speed increase in gluk's tests, documented here:" http://groups.google.com/groups?q=dirpref&num=100&hl=en&lr=&safe=off&rnum=2&; seld=905073910&ic=1 Does anyone know anything about this ? > > Log message: > > Replace FFS directory preference algorithm(dirpref) by new one. > > It allocates directory inode in the same cylinder group as a parent > > directory in. This speedup file/directory intensive operations on > > a big file systems in times. The benchmarks they're showing here are huge. 4 to 8 to 11 times faster depending on sync, async, or softdep. I don't know about you guys, but this sounds pretty nice to me. Any possibility we can implement this into FreeBSD ? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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