Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Wed, Jun 13, 2012 at 08:31:05PM +0200, Dirk wrote: > Sorry, but I am not deeply into kernel details, so it is not easy to > follow the thread and filter a result. > >The performance degradation you experience is simply that your > >config did not disable these, and if compiled against the right > >headers, they are used and effective. > What exactly do I have to do to avoid the perf degradation? Do I > have to compile a modified kernel and compile drbd.ko against that? > If yes, what changes to the kernel config? * there is no performance degradation in DRBD * what you perceive as performance degradation in DRBD is the difference in performance between barriers and flushes being used vs. being not supported * to "get back" your performance, explicitly disable barriers and flushes in drbd. Cheers, -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com