> > The major difference between the UltraLight kernel and the stock SL
> > kernel is that the SL kernel is configured with preemption enabled,
> > which is great for a user desktop, but not for a high-throughput
> > data server.
> and is this the only difference?
No. The UL kernel is built from newer sources (2.6.36), and there are a
few other config tweaks, but the PREEMPT_NONE is the change that is
really significant for server performace.
> > We have found that on our test server (16-core server Dell 2950 with 6
> > RAID6 shelves) with the SL kernel, under load, the "ksoftirqd" daemon
> so the speed benchmark is done accessing all 6 raid6 arrays or just one
> raid?
All 6.
- Charles
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