Date: Sat, 05 Jun 2010 01:58:35 +0200 From: Adam PAPAI <wooh@wooh.hu> To: freebsd-questions@freebsd.org, freebsd-hackers@freebsd.org Subject: sysbench / fileio - Linux vs. FreeBSD Message-ID: <4C09932B.6040808@wooh.hu>
next in thread | raw e-mail | index | archive | help
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi List, A week ago I started to benchmark Linux vs. FreeBSD on a Dell Poweredge 1850. CPU: 2 x 3.4Ghz Xeon (Dual Core) Memory: 8GB (4x2) Disk: 1 x SEAGATE ST373454LC D404 (SCSI) FreeBSD kazoku 8.0-RELEASE-p3 FreeBSD 8.0-RELEASE-p3 #0: Tue May 25 20:54:11 UTC 2010 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64 The tests with seqrewr, seqrd, rndrd, and so on is still going on, so I can only publish the seqwr result. (The PostgreSQL will be tested as well) (soft-updates are on) /dev/da0s1d on /usr (ufs, local, soft-updates) Tested with: sysbench --num-threads=$a --file-block-size=$bs --test=fileio - --file-total-size=2G --file-fsync-all=no --file-test-mode=seqwr run My first results (seqwr with 1,2,4,8,6,32 threads) can be found here. http://tech-blog.wooh.hu/~wooh/fbsd_vs_debian_seqwr.html Why FreeBSD is supreme with 1 and 2 thread. And why is it 2 and 3 times slower with 4-8-16-32 threads compared to Debian? The first two tests (1 thread and 2 thread) showed me that FreeBSD is supreme in I/O, but later tests showed me, that it can produce horrible I/O. How can I tune my disk to make it faster? Is it possible? What is the reason of the really slow I/O with more than 4 threads? What do you recommend me to do? Why is it damn slow with 8K blocksize? I have more than 15 FreeBSD servers in production environment and I don't want to change operating system due to I/O issues. I changed my OpenBSD servers to FreeBSD 3 years ago... :) When all tests are ready I'll publish all the results, including the postgresql benchmarks as well. Best Regards, - -- Adam PAPAI -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJMCZMrAAoJEGq0EWvh5uiI10MIAM1iZxFZ5xssKmawHl56Ruin zHHgb4Nc15waTLdzFGfllAayDlZqvvpoSpOVbp8qDZYlkTbYPF6aMjkehqMvQUEo nFs7WN2VaCSOhUUQSwjqfGdnMLW9H5uyW/ZkYvgoOjQjz/vewDV6Fi+ZfGmt5Zqw gV1ZlXFdAUOUW6c90ODOPxn+7XCA5UC2sUMPB+1iNxrTiiS6C2YQ0Vy1fCXvrhU3 51n0ES/7JBF4sk5dH1VNEU/8AeQRBOoKPuAHhZKRZZ1x+1dMkDhwdD+KUHGrRGJd fUAZmMhjE6fRG86FbwK5jrZizHZYpE3PfpZe6tI3SIvw7NbUNrRsCMSiel+0FBg= =k3Sw -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4C09932B.6040808>