Messages in this thread | | | Date | Wed, 27 Aug 2003 16:42:56 +0200 (CEST) | From | devik <> | Subject | Re: 2.4.21 on SMP has extra slow context switch |
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New informations. I tested more kernels. 2.4.21 and 22 with 2 CPUs are slow as hell. When I reboot with maxcpus=1 then all is suddenly ok. Also floppy drive was not detected in 2 CPU config while with maxcpus=1 it is. I placed lmbench data and dmesg output to http://luxik.cdi.cz/~devik/tmp/slow-smp/ in case someone knows what to do. I can do some other tests if you want me to do them.
thanks, devik
On Wed, 27 Aug 2003, devik wrote:
> Hello, > > I upgraded one SMP box (Soyo MB, 2x PII/350, 500MB) from > 2.4.8 (really) to 2.4.21 last week. Users start to complaint > that it is slow. > I run lmbench's context switch measurer and it's result is: > "size=0k ovr=5.41 > 2 169.26 > 3 111.28 > 4 83.99 > > While on very similar UP system (the same CPU & kernel) it is: > "size=0k ovr=3.50 > 2 1.80 > 3 2.08 > 4 2.89 > > Have someone even idea what is going on ? The systems seems to be > fairly stable but slooow. > I plan to reboot with single CPU at evening and/or upgrade to .22, > but the numbers above are weird. > > thanks, > ------------------------------- > Martin Devera aka devik > Linux kernel QoS/HTB maintainer > http://luxik.cdi.cz/~devik/ > >
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