Messages in this thread | | | Subject | Re: Very poor performance with 2.6.4 | From | Chris Mason <> | Date | Mon, 29 Mar 2004 09:23:48 -0500 |
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On Mon, 2004-03-29 at 01:16, Andreas Hartmann wrote: > Andrew Morton wrote: > > 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. > > This didn't help. > > > > > If that doesn't help, please run a comparative kernel profile. See > > Documentation/basic_profiling.txt. > > I'll do this next.
You might also want to try 2.6.5-rc2 which has a set of reiserfs fixes from 2.4.x. I'm hoping those will clean things up for you.
2.6.5-rc2-mm3 and higher have a number of other reiserfs performance fixes, but most of those were not in 2.4. Trying them out will complicate the picture (although I'm still interested in numbers from -mm).
-chris
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