Messages in this thread | | | Date | Sun, 28 Mar 2004 20:07:10 -0800 | From | Andrew Morton <> | Subject | Re: Very poor performance with 2.6.4 |
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Andreas Hartmann <andihartmann@freenet.de> wrote: > > I tested kernel 2.6.4. While compiling kdelibs and kdebase, I felt, that > kernel 2.6 seems to be slower than 2.4.25. > > So I did some tests to compare the performance directly. Therefore I > rebooted for everey test in init 2 (no X). > > I locally compiled 2.6.5rc2 3 times under 2.6.4 and under 2.4.25 on a > reiserfs LVM partition, which resides onto a IDE HD (using DMA) and got > the following result: > > In the middle, compiling under kernel 2.6.4 tooks 9.3% more real time than > under 2.4.25. > The user-processortime is about the same, but the system-processortime is > under 2.6.4 32.9% higher than under 2.4.25.
Try mounting your reiserfs filesystems with the `-o nolargeio=1' option.
If that doesn't help, please run a comparative kernel profile. See Documentation/basic_profiling.txt.
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