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
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