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

["Rafał Bilski" <rafalbilski@interia.pl>]

> 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


----------------------------------------------------------------------
Taśm Renaty i Andrzeja tu nie znajdziesz.
Mamy coś lepszego ... 

>>>http://link.interia.pl/f1b41