Dear list, with newer vanilla kernels we saw strange performance data with iozone on patchless clients: some OSTs had a lower write bandwith in the iozone benchmark, getting worse with record sizes below 1024. After lots of kernel builds, it looks like the kernel config entry CONFIG_SECURITY_FILE_CAPABILITIES is the one, wich introduces this problem. If CONFIG_SECURITY_FILE_CAPABILITIES is not set, iozone data look good, if it's compiled into the kernel, we see the problem: http://www.physik.uni-augsburg.de/~ralfu/LustreTest/Lustre_with_file_caps.html
Any idea, why file capabilities should affect the write performance on Lustre, and why it should only affect some OSTs? bye, Ralf -- Ralf Utermann _____________________________________________________________________ Universität Augsburg, Institut für Physik -- EDV-Betreuer Universitätsstr.1 D-86135 Augsburg Phone: +49-821-598-3231 SMTP: ralf.uterm...@physik.uni-augsburg.de Fax: -3411 _______________________________________________ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss