Messages in this thread | | | Date | Mon, 7 Jun 2004 19:50:11 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] Staircase Scheduler v6.3 for 2.6.7-rc2 |
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Phy Prabab <phyprabab@yahoo.com> wrote: > > Also please note the degredation between > 2.6.7-rc2-bk8-s63: > > A: 35.57user 38.18system 1:20.28elapsed 91%CPU > B: 35.54user 38.40system 1:19.48elapsed 93%CPU > C: 35.48user 38.28system 1:20.94elapsed 91%CPU > > Interesting how much more time is spent in both user > and kernel space between the two kernels. Also note > that 2.4.x exhibits even greater delta: > > A: 28.32user 29.51system 1:01.17elapsed 93%CPU > B: 28.54user 29.40system 1:01.48elapsed 92%CPU > B: 28.23user 28.80system 1:00.21elapsed 94%CPU > > Could anyone suggest a way to understand why the > difference between the 2.6 kernels and the 2.4 > kernels?
This is very very bad.
It's a uniprocessor machine, yes?
Could you describe the workload a bit more? Is it something which others can get their hands on?
It spends a lot of time in the kernel for a build system. I wonder why.
At a guess I'd say either a) you're hitting some path in the kernel which is going for a giant and bogus romp through memory, trashing CPU caches or b) your workload really dislikes run-child-first-after-fork or c) the page allocator is serving up pages which your access pattern dislikes or d) something else.
It's certainly interesting. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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