Re: high system cpu load during intense disk i/o

Rafał Bilski
2007-08-10T07:06:43Z

> So I would assume that delay_tsc() probably only makes the situation worse for
> the libata tests, but the real problem is at __switch_to() and schedule(). Do
> you agree with these assumptions?
Yes. I agree that percentage of CPU time is unreasonably high for these
functions. But not only for them.
> Is there a way to for oprofile to report the time spent in function calls
> depending on the call trace?
I don't know any.
> Thanks again for the help. I guess if that doesn't lead anywhere I'll just
> start compiling older vanilla kernels and see when the problem dissapears.
> But this needs a lot of time and I'm not sure for how long I'll be able to
> not offer any service with those disks (I was supposed to use RAID 0 to
> provide storage space with them, but with the current problems that wouldn't
> be so wise).
Probably this is the best and fastest way to diagnose problem.
> Dimitris
Regards
Rafał

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