Re: [patch] voluntary-preempt-2.6.8.1-P9

[Lee Revell]

On Tue, 2004-08-24 at 23:17, K.R. Foley wrote:
> Ingo Molnar wrote:
> > 
> >   http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P9
> > 

> latency trace of ~148 usec in scsi_request? I don't know if this is real 
> or not. Note the 79 usec here:
> 
> 00000001 0.107ms (+0.079ms): sd_init_command (scsi_prep_fn)
> 
> Entire trace is here:
> 
> http://www.cybsft.com/testresults/2.6.8.1-P9/latency_trace7.txt
> 
> 
> Is this possible? This is not the first time I have seen this. There is 
> another one here:
> 
> http://www.cybsft.com/testresults/2.6.8.1-P9/latency_trace5.txt
> 

This looks like a real latency.  What is
/sys/block/sdX/queue/max_sectors_kb set to?  Does lowering it help?

Lee

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