Hi, As I checked the commit, I suspect that you turned on CONFIG_DEBUG_MUTEXES in your .config. Could you test without this kind of debugging configs? Because f2fs uses many mutexes which results in high SW overhead. Thanks,
2013-11-09 (토), 10:31 +0800, guorke: > Dear all, > > I test f2fs performace via androbench with lot of f2fs commits. And i > found that, before commit > bfe35965ecdc6038314d03456b94d9ba451c289d(2013/05/28), the > sequential/random io and sqlite operation performance is better than > ext4. After this commit, the io performance drop too much, even test > it with the latest commit. And test result shows it slower than > ext4(~15%), like sequential read,sqlite insert/update/delete > operation,but random write still faster than ext4(~200%). > F2fs freeze all io operations when do a checkpoint, but ext4 no this > design, the checkpoint freeze operation block others metat data > update. in android phone, most application use sqlite , which it > caused lot of fsync/fdatasync. And this sync operation would cause lot > of checkpoint operation , than it caused database perfomance drop. > There's some optimization about writecheckpoint from fs_lock, to > semphone. but it is useless. > > any suggestion about it ? > > Ps, > 1. androbench is a tool which use to monitor android phone io > performance, it use fsync/fdatasync to simulate random io and sqlite > database operation. > 2. F2fs use default mount option, ext4 use > rw,noatime,noauto_da_alloc,commit=1,data=ordered. > > > > thanks > > gourke > > ------------------------------------------------------------------------------ > November Webinars for C, C++, Fortran Developers > Accelerate application performance with scalable programming models. Explore > techniques for threading, error checking, porting, and tuning. Get the most > from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg.clktrk > _______________________________________________ Linux-f2fs-devel mailing list > Linux-f2fs-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel -- Jaegeuk Kim Samsung ------------------------------------------------------------------------------ November Webinars for C, C++, Fortran Developers Accelerate application performance with scalable programming models. Explore techniques for threading, error checking, porting, and tuning. Get the most from the latest Intel processors and coprocessors. See abstracts and register http://pubads.g.doubleclick.net/gampad/clk?id=60136231&iu=/4140/ostg.clktrk _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
