On 10/06/2010 10:04 AM, Adam Carter wrote: > FYI some braindead benchmarking, reiserfs vs ext4, kernel 2.6.35-gentoo-r8 > > Copy same DVD image from internal reiserfs drive to freshly formatted > external drive; > reiserfs 1m37.530s > ext4 3m15.074s > > Then image copy on that external drive; > # time cp CentOS-5.3-x86_64-bin-DVD.iso CentOS-5.3-x86_64-bin-DVD.iso2 > # time cp CentOS-5.3-x86_64-bin-DVD.iso CentOS-5.3-x86_64-bin-DVD.iso3 > reiser 1m44.719s and 1m51.441s > ext4 3m24.337s and 4m30.534s > > Not that is matters, but create filesystem on 2TB drive; > reiserfs 1m17.373s > ext4 6m3.421s > > Didnt see that coming, I guess i'll stick with reiser3.... WOW! Those differences are crazy!
Please - I know benchmarking takes a lot of time - but could you check something: the behavior those fs have at what time they flush data from cache to disk is very different. Have you made sure that you measured the time it really needs? I mean the difference between: $ sync; time cp source dest and $ sync; time (cp source dest; sync) Only the last measures somewhat correctly. I'm irritated, because ext4 is extends based, and should behave much better with big files than reiser3... not only less fragmentation, but should also be faster... Bye, Daniel -- PGP key @ http://pgpkeys.pca.dfn.de/pks/lookup?search=0xBB9D4887&op=get # gpg --recv-keys --keyserver hkp://subkeys.pgp.net 0xBB9D4887
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