Messages in this thread | | | Subject | Re: [Ext2-devel] [BENCHMARK] fswide dirty bit for ext2 | From | Mingming Cao <> | Date | Thu, 30 Mar 2006 12:18:49 -0800 |
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On Tue, 2006-03-28 at 22:57 -0800, Valerie Henson wrote: > I am working on a file system wide dirty bit for ext2. This allows > you to skip a full fsck if you crash while the file system is not > being actively modified. > > Zach Brown was kind enough to run a few benchmarks comparing various > versions of ext2 and ext3. Results: > > ext2 ext2r *ext2fw* ext3 ext3wb > kuntar 17.86 19.59 17.58 21.10 30.60 > postmark 6.41 6.57 8.48 30.87 15.47 > tiobench 34.11 34.96 34.26 34.00 34.06 > > ext2: ext2: 4k blocks, noatime > ext2r: ext2: 4k blocks, noatime, reservations > ext2fw: ext2: 4k blocks, noatime, reservations, fswide > ext3: ext3: 4k blocks, 256m journal, noatime > ext3wb: ext3: 4k blocks, 256m journal, noatime, data=writeback > kuntar: expanding a cached uncompressed kernel tarball and syncing > postmark: postmark: numbers = 10000, transactions = 10000 > tiobench: tiobench: 16 threads, 256m size > > The summary is that ext2+fswide bit is the same as plain ext2 except > 30% slower on postmark. Slower postmark is expected given the orphan > inode list requires at least two writes to either the superblock or > another inode per file removal. An obvious improvement would be > per-block group orphan inode lists, which would require a non-trivial > but not frightening patch to fsck. (This might also be ported to > ext3.) Other ideas? > > I split out the ext2 reservations port into its own patch. > ext2+reservations alone is strangely slower than ext2+fswide on one > benchmark; I did some preliminary debugging but didn't find anything > obvious wrong as yet. The patches are available for anyone who wants > to track this down themselves before I get around to it. > Patch looks fine from 5 minutes review. I will look more closely at your port later. Does this regression on kuntar tests happened on ext3 also?
> Patches against 2.6.16-rc5-mm3 here: > > Fswide bit (includes reservations): > > http://infohost.nmt.edu/~val/patches/fswide_shorter_patch > > Reservations only: > > http://infohost.nmt.edu/~val/patches/resv_only_patch > > -VAL > > > ------------------------------------------------------- > This SF.Net email is sponsored by xPML, a groundbreaking scripting language > that extends applications into web and mobile media. Attend the live webcast > and join the prime developer group breaking into this new coding territory! > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 > _______________________________________________ > Ext2-devel mailing list > Ext2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/ext2-devel
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